{"id":608584,"date":"2026-09-16T08:50:04","date_gmt":"2026-09-16T01:50:04","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=608584"},"modified":"2026-09-16T08:50:04","modified_gmt":"2026-09-16T01:50:04","slug":"chu-vi-hinh-thang","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/","title":{"rendered":"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp"},"content":{"rendered":"<p>Chu vi h\u00ecnh thang b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y, c v\u00e0 d l\u00e0 hai c\u1ea1nh b\u00ean. Ri\u00eang h\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau n\u00ean c\u00f4ng th\u1ee9c r\u00fat g\u1ecdn th\u00e0nh P = a + b + 2c. Ph\u1ea7n d\u01b0\u1edbi \u0111i v\u00e0o c\u00e1c ch\u1ed7 hay v\u01b0\u1edbng: h\u00ecnh thang vu\u00f4ng, c\u00e1ch t\u00ecm c\u1ea1nh b\u00ean khi \u0111\u1ec1 ch\u1ec9 cho hai \u0111\u00e1y v\u00e0 \u0111\u01b0\u1eddng cao, t\u00e1m b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 c\u00e1c l\u1ed7i sai th\u01b0\u1eddng g\u1eb7p. C\u1ea7n \u00f4n \u0111\u1ecbnh ngh\u0129a, xem b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/hinh-thang\/\">h\u00ecnh thang<\/a>.<\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang<\/h2>\n<p>H\u00ecnh thang l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 hai c\u1ea1nh \u0111\u1ed1i song song. Chu vi c\u1ee7a n\u00f3 theo quy t\u1eafc chung c\u1ee7a m\u1ecdi \u0111a gi\u00e1c: c\u1ed9ng \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh bao quanh.<\/p>\n<blockquote><p>P = a + b + c + d<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>T\u00ean g\u1ecdi<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>P<\/td>\n<td>Chu vi<\/td>\n<td>T\u1ed5ng \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao quanh h\u00ecnh thang<\/td>\n<\/tr>\n<tr>\n<td>a<\/td>\n<td>\u0110\u00e1y l\u1edbn<\/td>\n<td>C\u1ea1nh song song d\u00e0i h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>b<\/td>\n<td>\u0110\u00e1y b\u00e9<\/td>\n<td>C\u1ea1nh song song ng\u1eafn h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>c<\/td>\n<td>C\u1ea1nh b\u00ean th\u1ee9 nh\u1ea5t<\/td>\n<td>C\u1ea1nh n\u1ed1i hai \u0111\u00e1y, kh\u00f4ng song song<\/td>\n<\/tr>\n<tr>\n<td>d<\/td>\n<td>C\u1ea1nh b\u00ean th\u1ee9 hai<\/td>\n<td>C\u1ea1nh n\u1ed1i hai \u0111\u00e1y c\u00f2n l\u1ea1i<\/td>\n<\/tr>\n<tr>\n<td>h<\/td>\n<td>\u0110\u01b0\u1eddng cao<\/td>\n<td>Kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u00e1y, kh\u00f4ng c\u00f3 trong chu vi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Hai \u0111i\u1ec1u c\u1ea7n nh\u1edb:<\/p>\n<ul>\n<li>\u0110\u01b0\u1eddng cao h kh\u00f4ng n\u1eb1m trong c\u00f4ng th\u1ee9c chu vi. N\u00f3 ch\u1ec9 d\u00f9ng khi t\u00ednh di\u1ec7n t\u00edch ho\u1eb7c l\u00e0m b\u01b0\u1edbc trung gian t\u00ecm c\u1ea1nh b\u00ean.<\/li>\n<li>B\u1ed1n s\u1ed1 h\u1ea1ng ph\u1ea3i c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o. \u0110\u1ec1 cho l\u1eabn m\u00e9t v\u00e0 x\u0103ng-ti-m\u00e9t th\u00ec quy \u0111\u1ed5i h\u1ebft r\u1ed3i m\u1edbi c\u1ed9ng.<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-609857 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-1.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P b\u1eb1ng a c\u1ed9ng b c\u1ed9ng c c\u1ed9ng d\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang c\u00e2n<\/h2>\n<p>H\u00ecnh thang c\u00e2n c\u00f3 hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau, t\u1eeb \u0111\u00f3 suy ra hai c\u1ea1nh b\u00ean d\u00e0i b\u1eb1ng nhau. \u0110\u00f3 l\u00e0 l\u00fd do r\u00fat g\u1ecdn \u0111\u01b0\u1ee3c. G\u1ecdi \u0111\u1ed9 d\u00e0i chung c\u1ee7a hai c\u1ea1nh b\u00ean l\u00e0 c, thay d = c v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t: P = a + b + c + c.<\/p>\n<blockquote><p>P = a + b + 2c<\/p><\/blockquote>\n<p>D\u1ea1ng r\u00fat g\u1ecdn c\u00f2n cho ph\u00e9p l\u00e0m b\u00e0i to\u00e1n ng\u01b0\u1ee3c: bi\u1ebft chu vi v\u00e0 hai \u0111\u00e1y th\u00ec t\u00ecm c\u1ea1nh b\u00ean b\u1eb1ng c = (P \u2212 a \u2212 b) : 2.<\/p>\n<p>V\u00ed d\u1ee5: H\u00ecnh thang c\u00e2n ABCD c\u00f3 \u0111\u00e1y l\u1edbn 12cm, \u0111\u00e1y b\u00e9 8cm, c\u1ea1nh b\u00ean 5cm.<\/p>\n<ol>\n<li>\u0110\u1ec1 cho h\u00ecnh thang c\u00e2n n\u00ean d\u00f9ng P = a + b + 2c.<\/li>\n<li>Thay s\u1ed1: P = 12 + 8 + 2 \u00d7 5.<\/li>\n<li>T\u00ednh: P = 12 + 8 + 10 = 30cm.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"size-full wp-image-609858 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-2.jpg\" alt=\"H\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau c\u00f9ng k\u00fd hi\u1ec7u c\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang vu\u00f4ng<\/h2>\n<p>H\u00ecnh thang vu\u00f4ng c\u00f3 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y. Nhi\u1ec1u b\u1ea1n \u0111i t\u00ecm c\u00f4ng th\u1ee9c ri\u00eang, nh\u01b0ng h\u00ecnh thang vu\u00f4ng kh\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c chu vi r\u00fat g\u1ecdn. Hai c\u1ea1nh b\u00ean c\u1ee7a n\u00f3 n\u00f3i chung kh\u00e1c nhau n\u00ean v\u1eabn ph\u1ea3i c\u1ed9ng \u0111\u1ee7 b\u1ed1n c\u1ea1nh: P = a + b + c + d.<\/p>\n<p>Kh\u00e1c bi\u1ec7t n\u1eb1m \u1edf ch\u1ed7: c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c c\u0169ng ch\u00ednh l\u00e0 \u0111\u01b0\u1eddng cao. Khi \u0111\u1ec1 cho \u0111\u01b0\u1eddng cao, b\u1ea1n c\u1ed9ng th\u1eb3ng n\u00f3 v\u00e0o chu vi nh\u01b0 m\u1ed9t c\u1ea1nh.<\/p>\n<p>V\u00ed d\u1ee5: H\u00ecnh thang vu\u00f4ng c\u00f3 \u0111\u00e1y l\u1edbn 10cm, \u0111\u00e1y b\u00e9 7cm, c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c 4cm, c\u1ea1nh b\u00ean xi\u00ean 5cm.<\/p>\n<ol>\n<li>\u0110\u1ec1 \u0111\u00e3 cho \u0111\u1ee7 b\u1ed1n c\u1ea1nh n\u00ean d\u00f9ng ngay P = a + b + c + d.<\/li>\n<li>Thay s\u1ed1: P = 10 + 7 + 4 + 5.<\/li>\n<li>T\u00ednh: P = 26cm.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"size-full wp-image-609859 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-3.jpg\" alt=\"H\u00ecnh thang vu\u00f4ng c\u00f3 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Ph\u00e2n bi\u1ec7t h\u00ecnh thang, h\u00ecnh thang c\u00e2n v\u00e0 h\u00ecnh thang vu\u00f4ng<\/h2>\n<p>Ba lo\u1ea1i n\u00e0y hay b\u1ecb l\u1eabn, m\u00e0 ch\u1ecdn nh\u1ea7m lo\u1ea1i l\u00e0 ch\u1ecdn nh\u1ea7m lu\u00f4n c\u00f4ng th\u1ee9c. B\u1ea3ng d\u01b0\u1edbi gi\u00fap b\u1ea1n nh\u1eadn ra nhanh:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i h\u00ecnh<\/th>\n<th>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft<\/th>\n<th>C\u00f4ng th\u1ee9c chu vi d\u00f9ng \u0111\u01b0\u1ee3c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh thang th\u01b0\u1eddng<\/td>\n<td>Ch\u1ec9 c\u00f3 hai c\u1ea1nh \u0111\u00e1y song song, hai c\u1ea1nh b\u00ean d\u00e0i ng\u1eafn t\u00f9y \u00fd<\/td>\n<td>P = a + b + c + d<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thang c\u00e2n<\/td>\n<td>Hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau, hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau<\/td>\n<td>P = a + b + 2c<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thang vu\u00f4ng<\/td>\n<td>C\u00f3 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi c\u1ea3 hai \u0111\u00e1y, c\u1ea1nh \u0111\u00f3 \u0111\u1ed3ng th\u1eddi l\u00e0 \u0111\u01b0\u1eddng cao<\/td>\n<td>P = a + b + c + d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>M\u1eb9o \u0111\u1ecdc \u0111\u1ec1: ch\u1ec9 khi trong \u0111\u1ec1 c\u00f3 ch\u1eef &#8220;c\u00e2n&#8221; b\u1ea1n m\u1edbi \u0111\u01b0\u1ee3c d\u00f9ng d\u1ea1ng r\u00fat g\u1ecdn P = a + b + 2c. Th\u1ea5y ch\u1eef &#8220;vu\u00f4ng&#8221; th\u00ec nh\u1edb r\u1eb1ng \u0111\u01b0\u1eddng cao \u0111\u00e3 l\u00e0 m\u1ed9t c\u1ea1nh, \u0111\u1eebng c\u1ed9ng n\u00f3 th\u00eam l\u1ea7n n\u1eefa.<\/p>\n<h2>C\u00e1ch t\u00ecm c\u1ea1nh b\u00ean khi \u0111\u1ec1 kh\u00f4ng cho s\u1eb5n<\/h2>\n<p>D\u1ea1ng quen thu\u1ed9c \u1edf l\u1edbp 8: \u0111\u1ec1 ch\u1ec9 cho hai \u0111\u00e1y v\u00e0 \u0111\u01b0\u1eddng cao c\u1ee7a h\u00ecnh thang c\u00e2n r\u1ed3i y\u00eau c\u1ea7u t\u00ednh chu vi. Ph\u1ea3i t\u00ecm c\u1ea1nh b\u00ean tr\u01b0\u1edbc b\u1eb1ng \u0111\u1ecbnh l\u00fd Pythagore.<\/p>\n<p>K\u1ebb hai \u0111\u01b0\u1eddng cao t\u1eeb hai \u0111\u1ec9nh c\u1ee7a \u0111\u00e1y b\u00e9 xu\u1ed1ng \u0111\u00e1y l\u1edbn. \u0110\u00e1y l\u1edbn chia th\u00e0nh ba \u0111o\u1ea1n: \u0111o\u1ea1n gi\u1eefa b\u1eb1ng \u0111\u00e1y b\u00e9 b, hai \u0111o\u1ea1n b\u00ean b\u1eb1ng nhau v\u00e0 d\u00e0i (a \u2212 b) : 2. M\u1ed7i c\u1ea1nh b\u00ean l\u00e0 c\u1ea1nh huy\u1ec1n c\u1ee7a tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng h v\u00e0 (a \u2212 b) : 2.<\/p>\n<blockquote><p>c = c\u0103n b\u1eadc hai c\u1ee7a [ h\u00b2 + ((a \u2212 b) : 2)\u00b2 ]<\/p><\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-609860 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-4.jpg\" alt=\"D\u00f9ng \u0111\u1ecbnh l\u00fd Pythagore t\u00ecm c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang c\u00e2n t\u1eeb \u0111\u01b0\u1eddng cao\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>V\u00ed d\u1ee5: H\u00ecnh thang c\u00e2n c\u00f3 \u0111\u00e1y l\u1edbn 14cm, \u0111\u00e1y b\u00e9 8cm, \u0111\u01b0\u1eddng cao 4cm.<\/p>\n<ol>\n<li>N\u1eeda hi\u1ec7u hai \u0111\u00e1y: (14 \u2212 8) : 2 = 3cm.<\/li>\n<li>B\u00ecnh ph\u01b0\u01a1ng hai c\u1ea1nh g\u00f3c vu\u00f4ng: 4\u00b2 = 16 v\u00e0 3\u00b2 = 9.<\/li>\n<li>C\u1ed9ng l\u1ea1i: 16 + 9 = 25.<\/li>\n<li>C\u1ea1nh b\u00ean: c = c\u0103n b\u1eadc hai c\u1ee7a 25 = 5cm.<\/li>\n<li>Chu vi: P = 14 + 8 + 2 \u00d7 5 = 32cm.<\/li>\n<\/ol>\n<p>C\u00e1ch n\u00e0y ch\u1ec9 d\u00f9ng cho h\u00ecnh thang c\u00e2n, v\u00ec n\u00f3 d\u1ef1a v\u00e0o vi\u1ec7c hai \u0111o\u1ea1n th\u1eeba b\u1eb1ng nhau.<\/p>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<h3>B\u00e0i 1: H\u00ecnh thang th\u01b0\u1eddng<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh thang ABCD c\u00f3 \u0111\u00e1y l\u1edbn 18cm, \u0111\u00e1y b\u00e9 12cm, hai c\u1ea1nh b\u00ean 7cm v\u00e0 9cm. T\u00ednh chu vi.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>\u0110\u1ec1 kh\u00f4ng c\u00f3 ch\u1eef &#8220;c\u00e2n&#8221; n\u00ean d\u00f9ng c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t P = a + b + c + d.<\/li>\n<li>Thay s\u1ed1: P = 18 + 12 + 7 + 9.<\/li>\n<li>C\u1ed9ng hai \u0111\u00e1y tr\u01b0\u1edbc: 18 + 12 = 30. C\u1ed9ng hai c\u1ea1nh b\u00ean: 7 + 9 = 16.<\/li>\n<li>Chu vi: P = 30 + 16 = 46cm.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: 46cm.<\/p>\n<h3>B\u00e0i 2: H\u00ecnh thang c\u00e2n<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh thang c\u00e2n MNPQ c\u00f3 hai \u0111\u00e1y 15cm v\u00e0 9cm, c\u1ea1nh b\u00ean 8cm. T\u00ednh chu vi.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>Hai c\u1ea1nh b\u00ean b\u1eb1ng nhau n\u00ean d\u00f9ng P = a + b + 2c.<\/li>\n<li>Thay s\u1ed1: P = 15 + 9 + 2 \u00d7 8.<\/li>\n<li>T\u00ednh ph\u1ea7n c\u1ea1nh b\u00ean: 2 \u00d7 8 = 16.<\/li>\n<li>Chu vi: P = 15 + 9 + 16 = 40cm.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: 40cm.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-609861 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-5.jpg\" alt=\"B\u00e0i t\u1eadp m\u1eabu h\u00ecnh thang c\u00e2n c\u00f3 hai \u0111\u00e1y 15cm v\u00e0 9cm\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3>B\u00e0i 3: H\u00ecnh thang vu\u00f4ng, ph\u1ea3i t\u00ecm c\u1ea1nh xi\u00ean<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh thang vu\u00f4ng c\u00f3 \u0111\u00e1y l\u1edbn 15cm, \u0111\u00e1y b\u00e9 9cm, c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y d\u00e0i 8cm. T\u00ednh chu vi.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>C\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c ch\u00ednh l\u00e0 \u0111\u01b0\u1eddng cao, h = 8cm.<\/li>\n<li>H\u1ea1 \u0111\u01b0\u1eddng cao t\u1eeb \u0111\u1ec9nh c\u00f2n l\u1ea1i c\u1ee7a \u0111\u00e1y b\u00e9 xu\u1ed1ng \u0111\u00e1y l\u1edbn, \u0111\u01b0\u1ee3c tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng 8cm v\u00e0 15 \u2212 9 = 6cm.<\/li>\n<li>C\u1ea1nh xi\u00ean = c\u0103n b\u1eadc hai c\u1ee7a (8\u00b2 + 6\u00b2) = c\u0103n b\u1eadc hai c\u1ee7a (64 + 36) = c\u0103n b\u1eadc hai c\u1ee7a 100 = 10cm.<\/li>\n<li>Chu vi: P = 15 + 9 + 8 + 10 = 42cm.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: 42cm.<\/p>\n<h3>B\u00e0i 4: H\u00ecnh thang c\u00e2n, t\u00ecm c\u1ea1nh b\u00ean tr\u01b0\u1edbc<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh thang c\u00e2n c\u00f3 \u0111\u00e1y l\u1edbn 30cm, \u0111\u00e1y b\u00e9 18cm, \u0111\u01b0\u1eddng cao 8cm. T\u00ednh chu vi.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>N\u1eeda hi\u1ec7u hai \u0111\u00e1y: (30 \u2212 18) : 2 = 6cm.<\/li>\n<li>C\u1ea1nh b\u00ean: c = c\u0103n b\u1eadc hai c\u1ee7a (8\u00b2 + 6\u00b2) = c\u0103n b\u1eadc hai c\u1ee7a 100 = 10cm.<\/li>\n<li>Chu vi: P = 30 + 18 + 2 \u00d7 10 = 68cm.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: 68cm.<\/p>\n<h3>B\u00e0i 5: \u0110\u01a1n v\u1ecb \u0111o kh\u00f4ng th\u1ed1ng nh\u1ea5t<\/h3>\n<p>\u0110\u1ec1: M\u1ea3nh \u0111\u1ea5t h\u00ecnh thang c\u00f3 \u0111\u00e1y l\u1edbn 1,2m, \u0111\u00e1y b\u00e9 80cm, hai c\u1ea1nh b\u00ean 45cm v\u00e0 50cm. T\u00ednh chu vi theo m\u00e9t.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>Quy \u0111\u1ed5i cho c\u00f9ng \u0111\u01a1n v\u1ecb: 1,2m = 120cm.<\/li>\n<li>D\u00f9ng c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t: P = a + b + c + d = 120 + 80 + 45 + 50.<\/li>\n<li>T\u00ednh: 120 + 80 = 200; 45 + 50 = 95; P = 200 + 95 = 295cm.<\/li>\n<li>\u0110\u1ed5i v\u1ec1 m\u00e9t theo y\u00eau c\u1ea7u \u0111\u1ec1: 295cm = 2,95m.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: 2,95m.<\/p>\n<h3>B\u00e0i 6: Bi\u1ebft chu vi, t\u00ecm c\u1ea1nh b\u00ean<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh thang c\u00e2n c\u00f3 chu vi 42cm, \u0111\u00e1y l\u1edbn 20cm, \u0111\u00e1y b\u00e9 12cm. T\u00ednh \u0111\u1ed9 d\u00e0i m\u1ed7i c\u1ea1nh b\u00ean.<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>T\u1eeb P = a + b + 2c, chuy\u1ec3n v\u1ebf \u0111\u01b0\u1ee3c 2c = P \u2212 a \u2212 b.<\/li>\n<li>Thay s\u1ed1: 2c = 42 \u2212 20 \u2212 12 = 10cm.<\/li>\n<li>M\u1ed7i c\u1ea1nh b\u00ean: c = 10 : 2 = 5cm.<\/li>\n<li>Th\u1eed l\u1ea1i: 20 + 12 + 2 \u00d7 5 = 42cm, \u0111\u00fang b\u1eb1ng chu vi \u0111\u1ec1 cho.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: m\u1ed7i c\u1ea1nh b\u00ean d\u00e0i 5cm.<\/p>\n<h3>B\u00e0i 7: B\u00e0i to\u00e1n c\u00f3 l\u1eddi v\u0103n v\u1ec1 h\u00e0ng r\u00e0o<\/h3>\n<p>\u0110\u1ec1: M\u1ed9t m\u1ea3nh v\u01b0\u1eddn h\u00ecnh thang c\u00f3 \u0111\u00e1y l\u1edbn 25m, \u0111\u00e1y b\u00e9 15m, hai c\u1ea1nh b\u00ean 12m v\u00e0 13m. B\u00e1c An r\u00e0o l\u01b0\u1edbi quanh v\u01b0\u1eddn v\u00e0 ch\u1eeba m\u1ed9t l\u1ed1i \u0111i r\u1ed9ng 2m \u0111\u1ec3 l\u00e0m c\u1ed5ng. H\u1ecfi b\u00e1c An c\u1ea7n bao nhi\u00eau m\u00e9t l\u01b0\u1edbi?<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>\u0110\u1ed9 d\u00e0i l\u01b0\u1edbi b\u1eb1ng chu vi m\u1ea3nh v\u01b0\u1eddn tr\u1eeb \u0111i ph\u1ea7n c\u1ed5ng, n\u00ean ph\u1ea3i t\u00ednh chu vi tr\u01b0\u1edbc.<\/li>\n<li>Chu vi: P = 25 + 15 + 12 + 13 = 65m.<\/li>\n<li>Tr\u1eeb ph\u1ea7n c\u1ed5ng: 65 \u2212 2 = 63m.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: b\u00e1c An c\u1ea7n 63m l\u01b0\u1edbi.<\/p>\n<h3>B\u00e0i 8: B\u00e0i to\u00e1n c\u00f3 l\u1eddi v\u0103n v\u1ec1 vi\u1ec1n ruy b\u0103ng<\/h3>\n<p>\u0110\u1ec1: B\u1ea1n Mai c\u1eaft m\u1ed9t mi\u1ebfng b\u00eca h\u00ecnh thang c\u00e2n c\u00f3 hai \u0111\u00e1y 24cm v\u00e0 16cm, \u0111\u01b0\u1eddng cao 3cm. Mai mu\u1ed1n d\u00e1n ruy b\u0103ng k\u00edn vi\u1ec1n mi\u1ebfng b\u00eca v\u00e0 \u0111ang c\u00f3 s\u1eb5n m\u1ed9t \u0111o\u1ea1n ruy b\u0103ng d\u00e0i 60cm. H\u1ecfi Mai c\u00f3 \u0111\u1ee7 ruy b\u0103ng kh\u00f4ng, th\u1eeba hay thi\u1ebfu bao nhi\u00eau x\u0103ng-ti-m\u00e9t?<\/p>\n<p>L\u1eddi gi\u1ea3i:<\/p>\n<ol>\n<li>\u0110\u1ec1 ch\u01b0a cho c\u1ea1nh b\u00ean, ph\u1ea3i t\u00ecm b\u1eb1ng Pythagore. N\u1eeda hi\u1ec7u hai \u0111\u00e1y: (24 \u2212 16) : 2 = 4cm.<\/li>\n<li>C\u1ea1nh b\u00ean: c = c\u0103n b\u1eadc hai c\u1ee7a (3\u00b2 + 4\u00b2) = c\u0103n b\u1eadc hai c\u1ee7a (9 + 16) = c\u0103n b\u1eadc hai c\u1ee7a 25 = 5cm.<\/li>\n<li>\u0110\u1ed9 d\u00e0i ruy b\u0103ng c\u1ea7n d\u00f9ng ch\u00ednh l\u00e0 chu vi: P = 24 + 16 + 2 \u00d7 5 = 50cm.<\/li>\n<li>So s\u00e1nh v\u1edbi \u0111o\u1ea1n c\u00f3 s\u1eb5n: 60 \u2212 50 = 10cm.<\/li>\n<\/ol>\n<p>\u0110\u00e1p s\u1ed1: Mai \u0111\u1ee7 ruy b\u0103ng v\u00e0 c\u00f2n th\u1eeba 10cm.<\/p>\n<h2>Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi t\u00ednh chu vi h\u00ecnh thang<\/h2>\n<ul>\n<li>Kh\u00f4ng th\u1ed1ng nh\u1ea5t \u0111\u01a1n v\u1ecb \u0111o. \u0110\u1ec1 hay cho l\u1eabn m\u00e9t, \u0111\u1ec1-xi-m\u00e9t v\u00e0 x\u0103ng-ti-m\u00e9t. Quy \u0111\u1ed5i ngay \u1edf d\u00f2ng \u0111\u1ea7u l\u1eddi gi\u1ea3i.<\/li>\n<li>Nh\u1ea7m chu vi v\u1edbi di\u1ec7n t\u00edch. Di\u1ec7n t\u00edch l\u00e0 S = (a + b) \u00d7 h : 2. Chu vi l\u00e0 P = a + b + c + d, kh\u00f4ng nh\u00e2n v\u1edbi \u0111\u01b0\u1eddng cao, c\u0169ng kh\u00f4ng chia cho 2.<\/li>\n<li>T\u01b0\u1edfng bi\u1ebft di\u1ec7n t\u00edch l\u00e0 suy ra \u0111\u01b0\u1ee3c chu vi. Kh\u00f4ng suy ra \u0111\u01b0\u1ee3c. Di\u1ec7n t\u00edch ch\u1ec9 li\u00ean quan hai \u0111\u00e1y v\u00e0 \u0111\u01b0\u1eddng cao, c\u00f2n chu vi c\u1ea7n hai c\u1ea1nh b\u00ean. Hai h\u00ecnh thang c\u00f9ng di\u1ec7n t\u00edch v\u1eabn c\u00f3 th\u1ec3 kh\u00e1c chu vi.<\/li>\n<li>Nh\u1ea7m c\u1ea1nh b\u00ean v\u1edbi \u0111\u01b0\u1eddng cao. Ch\u1ec9 \u1edf h\u00ecnh thang vu\u00f4ng m\u1edbi c\u00f3 m\u1ed9t c\u1ea1nh b\u00ean tr\u00f9ng \u0111\u01b0\u1eddng cao. \u1ede hai lo\u1ea1i c\u00f2n l\u1ea1i, c\u1ea1nh b\u00ean lu\u00f4n d\u00e0i h\u01a1n \u0111\u01b0\u1eddng cao.<\/li>\n<li>D\u00f9ng P = a + b + 2c cho h\u00ecnh thang kh\u00f4ng c\u00e2n. R\u00fat g\u1ecdn ch\u1ec9 h\u1ee3p l\u1ec7 khi hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, h\u00e3y \u0111\u1ecdc k\u1ef9 xem \u0111\u1ec1 c\u00f3 ch\u1eef &#8220;c\u00e2n&#8221; kh\u00f4ng.<\/li>\n<li>Qu\u00ean ghi \u0111\u01a1n v\u1ecb \u1edf \u0111\u00e1p s\u1ed1. Chu vi l\u00e0 m\u1ed9t \u0111\u1ed9 d\u00e0i, k\u1ebft qu\u1ea3 ph\u1ea3i k\u00e8m cm, dm ho\u1eb7c m \u0111\u00fang nh\u01b0 \u0111\u1ec1 y\u00eau c\u1ea7u.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-609862 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-6.jpg\" alt=\"C\u00e1c l\u1ed7i sai th\u01b0\u1eddng g\u1eb7p khi nh\u1ea7m chu vi v\u1edbi di\u1ec7n t\u00edch h\u00ecnh thang\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 chu vi h\u00ecnh thang<\/h2>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang l\u00e0 g\u00ec?<\/h3>\n<p>Chu vi h\u00ecnh thang b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y song song, c v\u00e0 d l\u00e0 hai c\u1ea1nh b\u00ean. C\u00f4ng th\u1ee9c \u0111\u00fang cho m\u1ecdi h\u00ecnh thang.<\/p>\n<h3>Chu vi h\u00ecnh thang c\u00e2n t\u00ednh th\u1ebf n\u00e0o?<\/h3>\n<p>H\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau n\u00ean chu vi t\u00ednh b\u1eb1ng P = a + b + 2c, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y, c l\u00e0 c\u1ea1nh b\u00ean. V\u00ed d\u1ee5 h\u00ecnh thang c\u00e2n c\u00f3 hai \u0111\u00e1y 12cm v\u00e0 8cm, c\u1ea1nh b\u00ean 5cm th\u00ec chu vi l\u00e0 12 + 8 + 2 \u00d7 5 = 30cm.<\/p>\n<h3>Bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh thang c\u00f3 t\u00ednh \u0111\u01b0\u1ee3c chu vi kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng t\u00ednh \u0111\u01b0\u1ee3c n\u1ebfu ch\u1ec9 bi\u1ebft di\u1ec7n t\u00edch v\u00e0 \u0111\u01b0\u1eddng cao. Di\u1ec7n t\u00edch cho bi\u1ebft t\u1ed5ng hai \u0111\u00e1y qua S = (a + b) \u00d7 h : 2, nh\u01b0ng chu vi c\u1ea7n th\u00eam hai c\u1ea1nh b\u00ean m\u00e0 di\u1ec7n t\u00edch kh\u00f4ng ch\u1ee9a. Mu\u1ed1n t\u00ednh chu vi, ph\u1ea3i c\u00f3 th\u00eam d\u1eef ki\u1ec7n v\u1ec1 c\u1ea1nh b\u00ean ho\u1eb7c v\u1ec1 g\u00f3c.<\/p>\n<h3>Chu vi h\u00ecnh thang vu\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c ri\u00eang kh\u00f4ng?<\/h3>\n<p>H\u00ecnh thang vu\u00f4ng kh\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c r\u00fat g\u1ecdn ri\u00eang, v\u1eabn d\u00f9ng P = a + b + c + d. Kh\u00e1c bi\u1ec7t l\u00e0 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y n\u00ean c\u1ea1nh \u0111\u00f3 \u0111\u1ed3ng th\u1eddi l\u00e0 \u0111\u01b0\u1eddng cao, c\u1ed9ng th\u1eb3ng v\u00e0o chu vi nh\u01b0 m\u1ed9t c\u1ea1nh.<\/p>\n<h3>L\u00e0m sao t\u00ednh c\u1ea1nh b\u00ean h\u00ecnh thang c\u00e2n khi ch\u1ec9 bi\u1ebft hai \u0111\u00e1y v\u00e0 \u0111\u01b0\u1eddng cao?<\/h3>\n<p>D\u00f9ng \u0111\u1ecbnh l\u00fd Pythagore v\u1edbi c\u00f4ng th\u1ee9c c = c\u0103n b\u1eadc hai c\u1ee7a [ h\u00b2 + ((a \u2212 b) : 2)\u00b2 ]. V\u00ed d\u1ee5 hai \u0111\u00e1y 14cm v\u00e0 8cm, \u0111\u01b0\u1eddng cao 4cm th\u00ec n\u1eeda hi\u1ec7u hai \u0111\u00e1y l\u00e0 3cm, c\u1ea1nh b\u00ean b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a (16 + 9) = 5cm.<\/p>\n<h3>\u0110\u01b0\u1eddng cao c\u00f3 \u0111\u01b0\u1ee3c c\u1ed9ng v\u00e0o chu vi h\u00ecnh thang kh\u00f4ng?<\/h3>\n<p>\u0110\u01b0\u1eddng cao kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ed9ng v\u00e0o chu vi, tr\u1eeb h\u00ecnh thang vu\u00f4ng. \u1ede h\u00ecnh thang vu\u00f4ng, c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c tr\u00f9ng \u0111\u01b0\u1eddng cao n\u00ean n\u00f3 v\u1ed1n \u0111\u00e3 l\u00e0 m\u1ed9t c\u1ea1nh. \u1ede hai lo\u1ea1i c\u00f2n l\u1ea1i, \u0111\u01b0\u1eddng cao n\u1eb1m trong h\u00ecnh, kh\u00f4ng thu\u1ed9c \u0111\u01b0\u1eddng bao.<\/p>\n<h3>B\u00e0i t\u1eadp t\u00ednh chu vi h\u00ecnh thang l\u1edbp 5 th\u01b0\u1eddng y\u00eau c\u1ea7u g\u00ec?<\/h3>\n<p>\u1ede l\u1edbp 5, \u0111\u1ec1 th\u01b0\u1eddng cho \u0111\u1ee7 b\u1ed1n c\u1ea1nh v\u00e0 h\u1ecdc sinh ch\u1ec9 c\u1ea7n c\u1ed9ng l\u1ea1i, ho\u1eb7c cho ba c\u1ea1nh c\u00f9ng chu vi r\u1ed3i t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i. D\u1ea1ng hay g\u1eb7p n\u1eefa l\u00e0 c\u00e1c c\u1ea1nh kh\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ec3 ki\u1ec3m tra k\u1ef9 n\u0103ng quy \u0111\u1ed5i. Ph\u1ea7n d\u00f9ng Pythagore t\u00ecm c\u1ea1nh b\u00ean thu\u1ed9c l\u1edbp 8.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Chu vi h\u00ecnh thang l\u00e0 ph\u00e9p c\u1ed9ng \u0111\u01a1n gi\u1ea3n khi n\u1eafm hai \u0111i\u1ec1u: P = a + b + c + d \u0111\u00fang cho m\u1ecdi h\u00ecnh thang, c\u00f2n P = a + b + 2c ch\u1ec9 d\u00e0nh cho h\u00ecnh thang c\u00e2n. Thi\u1ebfu c\u1ea1nh b\u00ean th\u00ec ngh\u0129 t\u1edbi Pythagore. \u0110\u1ec1 nhi\u1ec1u \u0111\u01a1n v\u1ecb th\u00ec quy \u0111\u1ed5i tr\u01b0\u1edbc r\u1ed3i m\u1edbi c\u1ed9ng, v\u00e0 nh\u1edb ghi \u0111\u01a1n v\u1ecb v\u00e0o \u0111\u00e1p s\u1ed1. B\u1ea1n h\u00e3y th\u1eed t\u1ef1 l\u00e0m l\u1ea1i t\u00e1m b\u00e0i tr\u00ean m\u00e0 kh\u00f4ng nh\u00ecn l\u1eddi gi\u1ea3i \u0111\u1ec3 ch\u1eafc tay h\u01a1n. Ngo\u00e0i ra, b\u1ea1n c\u00f3 th\u1ec3 luy\u1ec7n th\u00eam v\u1edbi <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-tu-giac\/\">chu vi h\u00ecnh t\u1ee9 gi\u00e1c<\/a>, v\u00ec h\u00ecnh thang l\u00e0 tr\u01b0\u1eddng h\u1ee3p ri\u00eang c\u1ee7a t\u1ee9 gi\u00e1c, v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thoi\/\">chu vi h\u00ecnh thoi<\/a> khi b\u1ed1n c\u1ea1nh b\u1eb1ng nhau.<br \/>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Chu vi h\u00ecnh thang b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y song song, c v\u00e0 d l\u00e0 hai c\u1ea1nh b\u00ean. C\u00f4ng th\u1ee9c \u0111\u00fang cho m\u1ecdi h\u00ecnh thang.\"}},{\"@type\":\"Question\",\"name\":\"Chu vi h\u00ecnh thang c\u00e2n t\u00ednh th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"H\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau n\u00ean chu vi t\u00ednh b\u1eb1ng P = a + b + 2c, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y, c l\u00e0 c\u1ea1nh b\u00ean. V\u00ed d\u1ee5 h\u00ecnh thang c\u00e2n c\u00f3 hai \u0111\u00e1y 12cm v\u00e0 8cm, c\u1ea1nh b\u00ean 5cm th\u00ec chu vi l\u00e0 12 + 8 + 2 \u00d7 5 = 30cm.\"}},{\"@type\":\"Question\",\"name\":\"Bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh thang c\u00f3 t\u00ednh \u0111\u01b0\u1ee3c chu vi kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Kh\u00f4ng t\u00ednh \u0111\u01b0\u1ee3c n\u1ebfu ch\u1ec9 bi\u1ebft di\u1ec7n t\u00edch v\u00e0 \u0111\u01b0\u1eddng cao. Di\u1ec7n t\u00edch cho bi\u1ebft t\u1ed5ng hai \u0111\u00e1y qua S = (a + b) \u00d7 h : 2, nh\u01b0ng chu vi c\u1ea7n th\u00eam hai c\u1ea1nh b\u00ean m\u00e0 di\u1ec7n t\u00edch kh\u00f4ng ch\u1ee9a. Mu\u1ed1n t\u00ednh chu vi, ph\u1ea3i c\u00f3 th\u00eam d\u1eef ki\u1ec7n v\u1ec1 c\u1ea1nh b\u00ean ho\u1eb7c v\u1ec1 g\u00f3c.\"}},{\"@type\":\"Question\",\"name\":\"Chu vi h\u00ecnh thang vu\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c ri\u00eang kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"H\u00ecnh thang vu\u00f4ng kh\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c r\u00fat g\u1ecdn ri\u00eang, v\u1eabn d\u00f9ng P = a + b + c + d. Kh\u00e1c bi\u1ec7t l\u00e0 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y n\u00ean c\u1ea1nh \u0111\u00f3 \u0111\u1ed3ng th\u1eddi l\u00e0 \u0111\u01b0\u1eddng cao, c\u1ed9ng th\u1eb3ng v\u00e0o chu vi nh\u01b0 m\u1ed9t c\u1ea1nh.\"}},{\"@type\":\"Question\",\"name\":\"L\u00e0m sao t\u00ednh c\u1ea1nh b\u00ean h\u00ecnh thang c\u00e2n khi ch\u1ec9 bi\u1ebft hai \u0111\u00e1y v\u00e0 \u0111\u01b0\u1eddng cao?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"D\u00f9ng \u0111\u1ecbnh l\u00fd Pythagore v\u1edbi c\u00f4ng th\u1ee9c c = c\u0103n b\u1eadc hai c\u1ee7a [ h\u00b2 + ((a \u2212 b) : 2)\u00b2 ]. V\u00ed d\u1ee5 hai \u0111\u00e1y 14cm v\u00e0 8cm, \u0111\u01b0\u1eddng cao 4cm th\u00ec n\u1eeda hi\u1ec7u hai \u0111\u00e1y l\u00e0 3cm, c\u1ea1nh b\u00ean b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a (16 + 9) = 5cm.\"}},{\"@type\":\"Question\",\"name\":\"\u0110\u01b0\u1eddng cao c\u00f3 \u0111\u01b0\u1ee3c c\u1ed9ng v\u00e0o chu vi h\u00ecnh thang kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u0110\u01b0\u1eddng cao kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ed9ng v\u00e0o chu vi, tr\u1eeb h\u00ecnh thang vu\u00f4ng. \u1ede h\u00ecnh thang vu\u00f4ng, c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c tr\u00f9ng \u0111\u01b0\u1eddng cao n\u00ean n\u00f3 v\u1ed1n \u0111\u00e3 l\u00e0 m\u1ed9t c\u1ea1nh. \u1ede hai lo\u1ea1i c\u00f2n l\u1ea1i, \u0111\u01b0\u1eddng cao n\u1eb1m trong h\u00ecnh, kh\u00f4ng thu\u1ed9c \u0111\u01b0\u1eddng bao.\"}},{\"@type\":\"Question\",\"name\":\"B\u00e0i t\u1eadp t\u00ednh chu vi h\u00ecnh thang l\u1edbp 5 th\u01b0\u1eddng y\u00eau c\u1ea7u g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u1ede l\u1edbp 5, \u0111\u1ec1 th\u01b0\u1eddng cho \u0111\u1ee7 b\u1ed1n c\u1ea1nh v\u00e0 h\u1ecdc sinh ch\u1ec9 c\u1ea7n c\u1ed9ng l\u1ea1i, ho\u1eb7c cho ba c\u1ea1nh c\u00f9ng chu vi r\u1ed3i t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i. D\u1ea1ng hay g\u1eb7p n\u1eefa l\u00e0 c\u00e1c c\u1ea1nh kh\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ec3 ki\u1ec3m tra k\u1ef9 n\u0103ng quy \u0111\u1ed5i. Ph\u1ea7n d\u00f9ng Pythagore t\u00ecm c\u1ea1nh b\u00ean thu\u1ed9c l\u1edbp 8.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chu vi h\u00ecnh thang b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d, v\u1edbi a v\u00e0 b l\u00e0 hai \u0111\u00e1y, c v\u00e0 d l\u00e0 hai c\u1ea1nh b\u00ean. Ri\u00eang h\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau n\u00ean c\u00f4ng th\u1ee9c r\u00fat g\u1ecdn th\u00e0nh P = a + b + [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":609856,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"chu vi h\u00ecnh thang","_yoast_wpseo_title":"Chu Vi H\u00ecnh Thang: C\u00f4ng Th\u1ee9c, H\u00ecnh Thang C\u00e2n V\u00e0 B\u00e0i T\u1eadp","_yoast_wpseo_metadesc":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-608584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Chu Vi H\u00ecnh Thang: C\u00f4ng Th\u1ee9c, H\u00ecnh Thang C\u00e2n V\u00e0 B\u00e0i T\u1eadp<\/title>\n<meta name=\"description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp\" \/>\n<meta property=\"og:description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/\" \/>\n<meta property=\"og:site_name\" content=\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hoanghamobilecom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/hoanghamobilecom\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-16T01:50:04+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"628\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Vo Giang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Vo Giang\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/\"},\"author\":{\"name\":\"Vo Giang\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#\\\/schema\\\/person\\\/72d0493d28396e6a0cdc358e9260c03c\"},\"headline\":\"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp\",\"datePublished\":\"2026-09-16T01:50:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/\"},\"wordCount\":3098,\"publisher\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/chu-vi-hinh-thang.jpg\",\"articleSection\":[\"G\u00f3c t\u00f2 m\u00f2\",\"Kh\u00e1m Ph\u00e1\",\"Ki\u1ebfn Th\u1ee9c\"],\"inLanguage\":\"vi\",\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/\",\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/\",\"name\":\"Chu Vi H\u00ecnh Thang: C\u00f4ng Th\u1ee9c, H\u00ecnh Thang C\u00e2n V\u00e0 B\u00e0i T\u1eadp\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/chu-vi-hinh-thang.jpg\",\"datePublished\":\"2026-09-16T01:50:04+00:00\",\"description\":\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#breadcrumb\"},\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#primaryimage\",\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/chu-vi-hinh-thang.jpg\",\"contentUrl\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/chu-vi-hinh-thang.jpg\",\"width\":1200,\"height\":628,\"caption\":\"chu-vi-hinh-thang\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-thang\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Trang ch\u1ee7\",\"item\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#website\",\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/\",\"name\":\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"vi\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#organization\",\"name\":\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\",\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/logo-text.png\",\"contentUrl\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/wp-content\\\/uploads\\\/2021\\\/12\\\/logo-text.png\",\"width\":256,\"height\":37,\"caption\":\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\"},\"image\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/hoanghamobilecom\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#\\\/schema\\\/person\\\/72d0493d28396e6a0cdc358e9260c03c\",\"name\":\"Vo Giang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g\",\"caption\":\"Vo Giang\"},\"description\":\"M\u00ecnh l\u00e0 Giang, m\u1ed9t ng\u01b0\u1eddi k\u1ec3 chuy\u1ec7n c\u00f4ng ngh\u1ec7, ch\u1ecdn c\u00e1ch tr\u1ea3i nghi\u1ec7m v\u00e0 chia s\u1ebb nh\u1eefng gi\u1ea3i ph\u00e1p th\u1ef1c t\u1ebf. V\u1edbi m\u00ecnh, m\u1ed9t thi\u1ebft b\u1ecb t\u1ed1t ch\u1ec9 khi n\u00f3 th\u1ef1c s\u1ef1 l\u00e0m cho cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y c\u1ee7a b\u1ea1n tr\u1edf n\u00ean d\u1ec5 d\u00e0ng v\u00e0 th\u00fa v\u1ecb h\u01a1n.\",\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/hoanghamobilecom\"],\"url\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/author\\\/giang-vo\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Chu Vi H\u00ecnh Thang: C\u00f4ng Th\u1ee9c, H\u00ecnh Thang C\u00e2n V\u00e0 B\u00e0i T\u1eadp","description":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/","og_locale":"vi_VN","og_type":"article","og_title":"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp","og_description":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.","og_url":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/","og_site_name":"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile","article_publisher":"https:\/\/www.facebook.com\/hoanghamobilecom","article_author":"https:\/\/www.facebook.com\/hoanghamobilecom","article_published_time":"2026-09-16T01:50:04+00:00","og_image":[{"width":1200,"height":628,"url":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg","type":"image\/jpeg"}],"author":"Vo Giang","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"Vo Giang","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"12 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#article","isPartOf":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/"},"author":{"name":"Vo Giang","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#\/schema\/person\/72d0493d28396e6a0cdc358e9260c03c"},"headline":"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp","datePublished":"2026-09-16T01:50:04+00:00","mainEntityOfPage":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/"},"wordCount":3098,"publisher":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#organization"},"image":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#primaryimage"},"thumbnailUrl":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg","articleSection":["G\u00f3c t\u00f2 m\u00f2","Kh\u00e1m Ph\u00e1","Ki\u1ebfn Th\u1ee9c"],"inLanguage":"vi","copyrightYear":"2026","copyrightHolder":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#organization"}},{"@type":"WebPage","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/","url":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/","name":"Chu Vi H\u00ecnh Thang: C\u00f4ng Th\u1ee9c, H\u00ecnh Thang C\u00e2n V\u00e0 B\u00e0i T\u1eadp","isPartOf":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#website"},"primaryImageOfPage":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#primaryimage"},"image":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#primaryimage"},"thumbnailUrl":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg","datePublished":"2026-09-16T01:50:04+00:00","description":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang P = a + b + c + d, h\u00ecnh thang c\u00e2n P = a + b + 2c, k\u00e8m 8 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 l\u1ed7i sai hay g\u1eb7p.","breadcrumb":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/"]}]},{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#primaryimage","url":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg","contentUrl":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-thang.jpg","width":1200,"height":628,"caption":"chu-vi-hinh-thang"},{"@type":"BreadcrumbList","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Trang ch\u1ee7","item":"https:\/\/hoanghamobile.com\/tin-tuc\/"},{"@type":"ListItem","position":2,"name":"Chu vi h\u00ecnh thang: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh h\u00ecnh thang c\u00e2n v\u00e0 b\u00e0i t\u1eadp"}]},{"@type":"WebSite","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#website","url":"https:\/\/hoanghamobile.com\/tin-tuc\/","name":"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile","description":"","publisher":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/hoanghamobile.com\/tin-tuc\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"vi"},{"@type":"Organization","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#organization","name":"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile","url":"https:\/\/hoanghamobile.com\/tin-tuc\/","logo":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#\/schema\/logo\/image\/","url":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2021\/12\/logo-text.png","contentUrl":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2021\/12\/logo-text.png","width":256,"height":37,"caption":"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile"},"image":{"@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/hoanghamobilecom"]},{"@type":"Person","@id":"https:\/\/hoanghamobile.com\/tin-tuc\/#\/schema\/person\/72d0493d28396e6a0cdc358e9260c03c","name":"Vo Giang","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/secure.gravatar.com\/avatar\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/77997fb123ed6295d07f6612ad5a1afc8283a96f9c379981b21365a22e2cff35?s=96&d=mm&r=g","caption":"Vo Giang"},"description":"M\u00ecnh l\u00e0 Giang, m\u1ed9t ng\u01b0\u1eddi k\u1ec3 chuy\u1ec7n c\u00f4ng ngh\u1ec7, ch\u1ecdn c\u00e1ch tr\u1ea3i nghi\u1ec7m v\u00e0 chia s\u1ebb nh\u1eefng gi\u1ea3i ph\u00e1p th\u1ef1c t\u1ebf. V\u1edbi m\u00ecnh, m\u1ed9t thi\u1ebft b\u1ecb t\u1ed1t ch\u1ec9 khi n\u00f3 th\u1ef1c s\u1ef1 l\u00e0m cho cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y c\u1ee7a b\u1ea1n tr\u1edf n\u00ean d\u1ec5 d\u00e0ng v\u00e0 th\u00fa v\u1ecb h\u01a1n.","sameAs":["https:\/\/www.facebook.com\/hoanghamobilecom"],"url":"https:\/\/hoanghamobile.com\/tin-tuc\/author\/giang-vo\/"}]}},"_links":{"self":[{"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/608584","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/users\/65"}],"replies":[{"embeddable":true,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/comments?post=608584"}],"version-history":[{"count":3,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/608584\/revisions"}],"predecessor-version":[{"id":610193,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/608584\/revisions\/610193"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/media\/609856"}],"wp:attachment":[{"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/media?parent=608584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/categories?post=608584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hoanghamobile.com\/tin-tuc\/wp-json\/wp\/v2\/tags?post=608584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}