{"id":612268,"date":"2026-09-28T09:42:13","date_gmt":"2026-09-28T02:42:13","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=612268"},"modified":"2026-09-28T09:42:13","modified_gmt":"2026-09-28T02:42:13","slug":"chu-vi-hinh-binh-hanh","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-binh-hanh\/","title":{"rendered":"Chu vi h\u00ecnh b\u00ecnh h\u00e0nh: c\u00f4ng th\u1ee9c, c\u00e1ch ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u00e0 b\u00e0i t\u1eadp"},"content":{"rendered":"<p><strong>Chu vi h\u00ecnh b\u00ecnh h\u00e0nh b\u1eb1ng 2 \u00d7 (a + b), trong \u0111\u00f3 a v\u00e0 b l\u00e0 \u0111\u1ed9 d\u00e0i hai c\u1ea1nh k\u1ec1 nhau.<\/strong> H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau n\u00ean b\u1ed1n c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 a, b, a, b. C\u1ed9ng l\u1ea1i \u0111\u01b0\u1ee3c a + b + a + b, g\u1ed9p th\u00e0nh P = 2 \u00d7 (a + b). Ch\u1ec9 c\u1ea7n bi\u1ebft hai c\u1ea1nh k\u1ec1 l\u00e0 t\u00ednh \u0111\u01b0\u1ee3c chu vi.<\/p>\n<p>Ph\u1ea7n d\u01b0\u1edbi \u0111i th\u1eb3ng v\u00e0o ph\u1ea7n t\u00ednh to\u00e1n: b\u1ea3ng k\u00fd hi\u1ec7u, c\u00e1ch ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u1edbi chi\u1ec1u cao, ba d\u1ea1ng b\u00e0i hay g\u1eb7p, hai tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t, b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc v\u00e0 b\u00e0i t\u1ef1 luy\u1ec7n k\u00e8m \u0111\u00e1p s\u1ed1. C\u1ea7n \u00f4n l\u1ea1i kh\u00e1i ni\u1ec7m c\u00f9ng d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft, b\u1ea1n xem b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/hinh-binh-hanh-la-gi\/\">h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 g\u00ec<\/a>.<\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh<\/h2>\n<p>Chu vi l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh bao quanh h\u00ecnh. G\u1ecdi hai c\u1ea1nh k\u1ec1 l\u00e0 a v\u00e0 b, ta c\u00f3 <strong>c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh: P = 2 \u00d7 (a + b)<\/strong>.<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<th>L\u01b0u \u00fd<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>P<\/td>\n<td>Chu vi h\u00ecnh b\u00ecnh h\u00e0nh<\/td>\n<td>\u0110\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i: cm, dm, m<\/td>\n<\/tr>\n<tr>\n<td>a<\/td>\n<td>C\u1ea1nh \u0111\u00e1y<\/td>\n<td>C\u1ea1nh n\u1eb1m ngang trong h\u00ecnh v\u1ebd<\/td>\n<\/tr>\n<tr>\n<td>b<\/td>\n<td>C\u1ea1nh b\u00ean, k\u1ec1 v\u1edbi c\u1ea1nh a<\/td>\n<td>Kh\u00f4ng ph\u1ea3i chi\u1ec1u cao<\/td>\n<\/tr>\n<tr>\n<td>h<\/td>\n<td>Chi\u1ec1u cao<\/td>\n<td>Ch\u1ec9 d\u00f9ng t\u00ednh di\u1ec7n t\u00edch<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V\u00ed d\u1ee5: h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 9 cm, c\u1ea1nh b\u00ean 6 cm. Ta t\u00ednh P = 2 \u00d7 (9 + 6) = 2 \u00d7 15 = 30 cm. Ch\u1ec9 hai b\u01b0\u1edbc: c\u1ed9ng hai c\u1ea1nh r\u1ed3i nh\u00e2n \u0111\u00f4i.<\/p>\n<p>Tr\u01b0\u1edbc khi c\u1ed9ng, a v\u00e0 b ph\u1ea3i c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o. N\u1ebfu m\u1ed9t c\u1ea1nh t\u00ednh b\u1eb1ng m\u00e9t, c\u1ea1nh kia b\u1eb1ng x\u0103ng-ti-m\u00e9t, b\u1ea1n \u0111\u1ed5i v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb r\u1ed3i m\u1edbi t\u00ednh.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-612271\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-1.jpg\" alt=\"chu vi h\u00ecnh b\u00ecnh h\u00e0nh v\u00e0 c\u00f4ng th\u1ee9c P = 2 \u00d7 (a + b)\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u00e0 chi\u1ec1u cao<\/h2>\n<p>\u0110\u00e2y l\u00e0 ch\u1ed7 h\u1ecdc sinh sai nhi\u1ec1u nh\u1ea5t: l\u1ea5y chi\u1ec1u cao thay cho c\u1ea1nh b\u00ean r\u1ed3i \u0111\u01b0a v\u00e0o c\u00f4ng th\u1ee9c chu vi, khi\u1ebfn b\u00e0i sai t\u1eeb d\u00f2ng \u0111\u1ea7u.<\/p>\n<p><strong>C\u1ea1nh b\u00ean<\/strong> l\u00e0 m\u1ed9t c\u1ea1nh th\u1eadt c\u1ee7a h\u00ecnh, n\u1ed1i hai \u0111\u1ec9nh li\u1ec1n nhau, \u0111o \u0111\u01b0\u1ee3c b\u1eb1ng th\u01b0\u1edbc. <strong>Chi\u1ec1u cao<\/strong> kh\u00f4ng ph\u1ea3i l\u00e0 c\u1ea1nh, m\u00e0 l\u00e0 \u0111o\u1ea1n h\u1ea1 vu\u00f4ng g\u00f3c t\u1eeb m\u1ed9t \u0111\u1ec9nh xu\u1ed1ng c\u1ea1nh \u0111\u1ed1i di\u1ec7n, th\u01b0\u1eddng v\u1ebd n\u00e9t \u0111\u1ee9t k\u00e8m k\u00fd hi\u1ec7u g\u00f3c vu\u00f4ng.<\/p>\n<p>V\u00ec sao kh\u00f4ng th\u1ec3 thay cho nhau? H\u00e3y h\u00ecnh dung c\u1ea1nh b\u00ean l\u00e0 chi\u1ebfc thang d\u1ef1ng nghi\u00eang v\u00e0o t\u01b0\u1eddng, chi\u1ec1u cao l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111\u1ea7u thang xu\u1ed1ng \u0111\u1ea5t. Thang c\u00e0ng nghi\u00eang th\u00ec kho\u1ea3ng c\u00e1ch \u1ea5y c\u00e0ng nh\u1ecf, nh\u01b0ng chi\u1ec1u d\u00e0i thang kh\u00f4ng \u0111\u1ed5i. H\u00ecnh b\u00ecnh h\u00e0nh c\u0169ng v\u1eady: chi\u1ec1u cao h lu\u00f4n ng\u1eafn h\u01a1n ho\u1eb7c b\u1eb1ng c\u1ea1nh b\u00ean b, hai gi\u00e1 tr\u1ecb ch\u1ec9 b\u1eb1ng nhau khi h\u00ecnh l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p>Ghi nh\u1edb: chu vi c\u1ed9ng c\u00e1c c\u1ea1nh n\u00ean ch\u1ec9 d\u00f9ng c\u1ea1nh; di\u1ec7n t\u00edch d\u00f9ng S = a \u00d7 h, t\u1ee9c \u0111\u00e1y nh\u00e2n chi\u1ec1u cao, n\u00ean m\u1edbi c\u1ea7n chi\u1ec1u cao. Di\u1ec7n t\u00edch <strong>kh\u00f4ng ph\u1ea3i<\/strong> a \u00d7 b. Th\u1ea5y ch\u1eef &#8220;chi\u1ec1u cao&#8221; trong \u0111\u1ec1 t\u00ednh chu vi th\u00ec ph\u1ea7n l\u1edbn l\u00e0 d\u1eef ki\u1ec7n th\u1eeba.<\/p>\n<h2>C\u00e1c d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p><strong>D\u1ea1ng 1 \u2014 T\u00ecm chu vi khi bi\u1ebft hai c\u1ea1nh k\u1ec1.<\/strong> Thay s\u1ed1 v\u00e0o P = 2 \u00d7 (a + b). V\u1edbi a = 12 cm v\u00e0 b = 7 cm: P = 2 \u00d7 19 = 38 cm.<\/p>\n<p><strong>D\u1ea1ng 2 \u2014 T\u00ecm m\u1ed9t c\u1ea1nh khi bi\u1ebft chu vi v\u00e0 c\u1ea1nh c\u00f2n l\u1ea1i.<\/strong> T\u1eeb P = 2 \u00d7 (a + b) suy ra a + b = P : 2, n\u00ean c\u1ea1nh c\u1ea7n t\u00ecm b\u1eb1ng (P : 2) \u2212 a. V\u00ed d\u1ee5 chu vi 48 cm, m\u1ed9t c\u1ea1nh 15 cm: c\u1ea1nh c\u00f2n l\u1ea1i l\u00e0 24 \u2212 15 = 9 cm.<\/p>\n<p><strong>D\u1ea1ng 3 \u2014 \u0110\u1ec1 cho di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao.<\/strong> Nhi\u1ec1u b\u1ea1n ngh\u0129 c\u1ee9 c\u00f3 di\u1ec7n t\u00edch l\u00e0 t\u00ednh \u0111\u01b0\u1ee3c chu vi, nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng \u0111\u00fang. Di\u1ec7n t\u00edch t\u00ednh b\u1eb1ng S = a \u00d7 h, n\u00ean hai d\u1eef ki\u1ec7n n\u00e0y ch\u1ec9 cho ra c\u1ea1nh \u0111\u00e1y a; c\u1ea1nh b\u00ean b kh\u00f4ng xu\u1ea5t hi\u1ec7n trong c\u00f4ng th\u1ee9c \u0111\u00f3. <strong>N\u1ebfu \u0111\u1ec1 ch\u1ec9 cho di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao th\u00ec kh\u00f4ng t\u00ednh \u0111\u01b0\u1ee3c chu vi<\/strong>, ph\u1ea3i cho th\u00eam c\u1ea1nh b\u00ean.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-612272\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-2.jpg\" alt=\"chu-vi-hinh-binh-hanh-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u1ea3ng t\u00f3m t\u1eaft chu vi v\u00e0 di\u1ec7n t\u00edch c\u00e1c h\u00ecnh li\u00ean quan<\/h2>\n<p>H\u00ecnh thoi, h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 h\u00ecnh vu\u00f4ng \u0111\u1ec1u l\u00e0 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, n\u00ean c\u00f4ng th\u1ee9c chu vi c\u1ee7a ch\u00fang suy ra t\u1eeb P = 2 \u00d7 (a + b). H\u00ecnh thoi c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, thay b = a ta \u0111\u01b0\u1ee3c P = 4 \u00d7 a. H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 l\u00e0 chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng.<\/p>\n<table>\n<thead>\n<tr>\n<th>H\u00ecnh<\/th>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>C\u00f4ng th\u1ee9c chu vi<\/th>\n<th>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh b\u00ecnh h\u00e0nh<\/td>\n<td>Hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau<\/td>\n<td>P = 2 \u00d7 (a + b)<\/td>\n<td>S = a \u00d7 h (\u0111\u00e1y \u00d7 chi\u1ec1u cao)<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thoi<\/td>\n<td>B\u1ed1n c\u1ea1nh b\u1eb1ng nhau<\/td>\n<td>P = 4 \u00d7 a<\/td>\n<td>S = (d1 \u00d7 d2) : 2<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh ch\u1eef nh\u1eadt<\/td>\n<td>B\u1ed1n g\u00f3c vu\u00f4ng<\/td>\n<td>P = 2 \u00d7 (d\u00e0i + r\u1ed9ng)<\/td>\n<td>S = d\u00e0i \u00d7 r\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh vu\u00f4ng<\/td>\n<td>B\u1ed1n c\u1ea1nh b\u1eb1ng nhau, b\u1ed1n g\u00f3c vu\u00f4ng<\/td>\n<td>P = 4 \u00d7 a<\/td>\n<td>S = a \u00d7 a<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thang<\/td>\n<td>M\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song<\/td>\n<td>P = t\u1ed5ng b\u1ed1n c\u1ea1nh<\/td>\n<td>S = (a + b) \u00d7 h : 2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Hai c\u1ed9t tr\u00ean cho th\u1ea5y \u0111i\u1ec3m d\u1ec5 l\u1eabn nh\u1ea5t: chu vi lu\u00f4n ch\u1ec9 d\u00f9ng \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh, c\u00f2n di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh m\u1edbi c\u1ea7n chi\u1ec1u cao. C\u00f9ng nh\u00f3m b\u00e0i n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 xem th\u00eam <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thang\/\">c\u00e1ch t\u00ednh chu vi h\u00ecnh thang<\/a> v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-tam-giac-vuong\/\">chu vi tam gi\u00e1c vu\u00f4ng<\/a>.<\/p>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<h3>B\u00e0i 1: T\u00ednh chu vi khi bi\u1ebft hai c\u1ea1nh<\/h3>\n<p>\u0110\u1ec1: M\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 12 cm, c\u1ea1nh b\u00ean 8 cm. T\u00ednh chu vi.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: Hai s\u1ed1 \u0111\u00e3 c\u00f9ng \u0111\u01a1n v\u1ecb cm v\u00e0 \u0111\u1ec1u l\u00e0 c\u1ea1nh, n\u00ean thay th\u1eb3ng v\u00e0o c\u00f4ng th\u1ee9c.<\/p>\n<p>L\u1eddi gi\u1ea3i: T\u1ed5ng hai c\u1ea1nh k\u1ec1 l\u00e0 12 + 8 = 20 cm. Chu vi: P = 2 \u00d7 20 = 40 cm.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 40 cm.<\/p>\n<h3>B\u00e0i 2: T\u00ecm c\u1ea1nh khi bi\u1ebft chu vi (d\u1ea1ng ng\u01b0\u1ee3c)<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh b\u00ecnh h\u00e0nh ABCD c\u00f3 chu vi 54 cm, c\u1ea1nh AB d\u00e0i 17 cm. T\u00ednh c\u1ea1nh BC.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: Chia chu vi cho 2 \u0111\u1ec3 c\u00f3 t\u1ed5ng hai c\u1ea1nh k\u1ec1, r\u1ed3i tr\u1eeb c\u1ea1nh \u0111\u00e3 bi\u1ebft.<\/p>\n<p>L\u1eddi gi\u1ea3i: N\u1eeda chu vi b\u1eb1ng t\u1ed5ng hai c\u1ea1nh k\u1ec1: 54 : 2 = 27 cm. C\u1ea1nh BC = 27 \u2212 17 = 10 cm. Th\u1eed l\u1ea1i: 2 \u00d7 (17 + 10) = 2 \u00d7 27 = 54 cm, kh\u1edbp v\u1edbi \u0111\u1ec1.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 10 cm.<\/p>\n<h3>B\u00e0i 3: B\u00e0i c\u00f3 d\u1eef ki\u1ec7n th\u1eeba<\/h3>\n<p>\u0110\u1ec1: M\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 14 cm, chi\u1ec1u cao 6 cm, c\u1ea1nh b\u00ean 9 cm. T\u00ednh chu vi.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: G\u1ea1ch b\u1ecf chi\u1ec1u cao tr\u01b0\u1edbc khi t\u00ednh, v\u00ec chu vi kh\u00f4ng d\u00f9ng chi\u1ec1u cao.<\/p>\n<p>L\u1eddi gi\u1ea3i: Hai c\u1ea1nh k\u1ec1 l\u00e0 14 cm v\u00e0 9 cm. Chu vi: P = 2 \u00d7 (14 + 9) = 2 \u00d7 23 = 46 cm.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 46 cm.<\/p>\n<h3>B\u00e0i 4: B\u00e0i c\u1ea7n \u0111\u1ed5i \u0111\u01a1n v\u1ecb m\u00e9t sang x\u0103ng-ti-m\u00e9t<\/h3>\n<p>\u0110\u1ec1: M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 1,2 m v\u00e0 c\u1ea1nh b\u00ean 80 cm. T\u00ednh chu vi theo m\u00e9t.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: \u0110\u01b0a hai c\u1ea1nh v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb cm, t\u00ednh xong r\u1ed3i \u0111\u1ed5i k\u1ebft qu\u1ea3 sang m\u00e9t.<\/p>\n<p>L\u1eddi gi\u1ea3i: \u0110\u1ed5i 1,2 m = 120 cm. T\u1ed5ng hai c\u1ea1nh k\u1ec1: 120 + 80 = 200 cm. Chu vi: P = 2 \u00d7 200 = 400 cm. \u0110\u1ed5i l\u1ea1i: 400 cm = 4 m.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 4 m.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-612273\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-3.jpg\" alt=\"chu-vi-hinh-binh-hanh-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3>B\u00e0i 5: T\u1eeb di\u1ec7n t\u00edch t\u00ecm c\u1ea1nh \u0111\u00e1y r\u1ed3i t\u00ednh chu vi<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 di\u1ec7n t\u00edch 96 cm\u00b2, chi\u1ec1u cao 8 cm v\u00e0 c\u1ea1nh b\u00ean 10 cm. T\u00ednh chu vi.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: D\u00f9ng S = a \u00d7 h \u0111\u1ec3 t\u00ecm c\u1ea1nh \u0111\u00e1y a, sau \u0111\u00f3 m\u1edbi \u00e1p c\u00f4ng th\u1ee9c chu vi.<\/p>\n<p>L\u1eddi gi\u1ea3i: T\u1eeb S = a \u00d7 h suy ra c\u1ea1nh \u0111\u00e1y a = 96 : 8 = 12 cm. Chu vi: P = 2 \u00d7 (12 + 10) = 2 \u00d7 22 = 44 cm.<\/p>\n<p>B\u00e0i n\u00e0y gi\u1ea3i \u0111\u01b0\u1ee3c v\u00ec \u0111\u1ec1 cho s\u1eb5n c\u1ea1nh b\u00ean. N\u1ebfu ch\u1ec9 c\u00f3 di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao th\u00ec kh\u00f4ng t\u00ecm ra chu vi.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 44 cm.<\/p>\n<h3>B\u00e0i 6: B\u00e0i to\u00e1n t\u1ed5ng v\u00e0 hi\u1ec7u<\/h3>\n<p>\u0110\u1ec1: H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 chu vi 60 cm, c\u1ea1nh \u0111\u00e1y d\u00e0i h\u01a1n c\u1ea1nh b\u00ean 6 cm. T\u00ednh \u0111\u1ed9 d\u00e0i m\u1ed7i c\u1ea1nh.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: T\u00ecm n\u1eeda chu vi \u0111\u1ec3 c\u00f3 t\u1ed5ng hai c\u1ea1nh, r\u1ed3i gi\u1ea3i b\u00e0i to\u00e1n t\u1ed5ng \u2013 hi\u1ec7u.<\/p>\n<p>L\u1eddi gi\u1ea3i: N\u1eeda chu vi l\u00e0 t\u1ed5ng hai c\u1ea1nh k\u1ec1: 60 : 2 = 30 cm. C\u1ea1nh \u0111\u00e1y: (30 + 6) : 2 = 18 cm. C\u1ea1nh b\u00ean: 30 \u2212 18 = 12 cm. Th\u1eed l\u1ea1i: 2 \u00d7 (18 + 12) = 2 \u00d7 30 = 60 cm.<\/p>\n<p>\u0110\u00e1p s\u1ed1: c\u1ea1nh \u0111\u00e1y 18 cm, c\u1ea1nh b\u00ean 12 cm.<\/p>\n<h3>B\u00e0i 7: \u0110\u1ed5i \u0111\u01a1n v\u1ecb \u0111\u1ec1-xi-m\u00e9t v\u00e0 m\u00e9t<\/h3>\n<p>\u0110\u1ec1: M\u1ed9t khung tranh h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 25 dm, c\u1ea1nh b\u00ean 1,5 m. T\u00ednh chu vi theo m\u00e9t.<\/p>\n<p>H\u01b0\u1edbng l\u00e0m: 1 m = 10 dm, n\u00ean \u0111\u1ed5i c\u1ea1nh b\u00ean sang dm cho c\u00f9ng \u0111\u01a1n v\u1ecb v\u1edbi c\u1ea1nh \u0111\u00e1y.<\/p>\n<p>L\u1eddi gi\u1ea3i: \u0110\u1ed5i 1,5 m = 15 dm. T\u1ed5ng hai c\u1ea1nh k\u1ec1: 25 + 15 = 40 dm. Chu vi: P = 2 \u00d7 40 = 80 dm. \u0110\u1ed5i l\u1ea1i: 80 dm = 8 m.<\/p>\n<p>\u0110\u00e1p s\u1ed1: 8 m.<\/p>\n<h2>B\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n c\u00f3 \u0111\u00e1p s\u1ed1<\/h2>\n<p>B\u1ea1n l\u00e0m b\u1ed1n b\u00e0i d\u01b0\u1edbi r\u1ed3i \u0111\u1ed1i chi\u1ebfu \u0111\u00e1p s\u1ed1 \u1edf cu\u1ed1i m\u1ee5c.<\/p>\n<ul>\n<li><strong>B\u00e0i A.<\/strong> H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai c\u1ea1nh k\u1ec1 15 cm v\u00e0 11 cm. T\u00ednh chu vi.<\/li>\n<li><strong>B\u00e0i B.<\/strong> H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 chu vi 72 cm, m\u1ed9t c\u1ea1nh d\u00e0i 22 cm. T\u00ednh c\u1ea1nh k\u1ec1 v\u1edbi n\u00f3.<\/li>\n<li><strong>B\u00e0i C.<\/strong> H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 2 m, c\u1ea1nh b\u00ean 140 cm. T\u00ednh chu vi theo m\u00e9t.<\/li>\n<li><strong>B\u00e0i D.<\/strong> H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 di\u1ec7n t\u00edch 120 cm\u00b2, chi\u1ec1u cao 10 cm, c\u1ea1nh b\u00ean 7 cm. T\u00ednh chu vi.<\/li>\n<\/ul>\n<p>\u0110\u00e1p s\u1ed1: A. 52 cm \u2014 B. 14 cm \u2014 C. 6,8 m \u2014 D. 38 cm.<\/p>\n<h2>Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh<\/h2>\n<ul>\n<li><strong>L\u1ea5y chi\u1ec1u cao thay c\u1ea1nh b\u00ean.<\/strong> Th\u1ea5y hai con s\u1ed1 l\u00e0 thay ngay v\u00e0o c\u00f4ng th\u1ee9c m\u00e0 kh\u00f4ng \u0111\u1ecdc k\u1ef9.<\/li>\n<li><strong>Qu\u00ean nh\u00e2n 2.<\/strong> T\u00ednh xong a + b r\u1ed3i ghi lu\u00f4n, nh\u01b0ng \u0111\u00f3 m\u1edbi l\u00e0 n\u1eeda chu vi.<\/li>\n<li><strong>C\u1ed9ng s\u1ed1 kh\u00e1c \u0111\u01a1n v\u1ecb.<\/strong> C\u1ed9ng th\u1eb3ng 1,2 m v\u1edbi 80 cm ra 81,2 l\u00e0 sai.<\/li>\n<li><strong>D\u00f9ng a \u00d7 b cho di\u1ec7n t\u00edch.<\/strong> Di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 \u0111\u00e1y nh\u00e2n chi\u1ec1u cao, kh\u00f4ng ph\u1ea3i hai c\u1ea1nh nh\u00e2n nhau.<\/li>\n<li><strong>Ghi \u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch cho chu vi.<\/strong> Chu vi l\u00e0 \u0111\u1ed9 d\u00e0i, \u0111\u01a1n v\u1ecb l\u00e0 cm, dm, m, kh\u00f4ng ph\u1ea3i cm\u00b2.<\/li>\n<li><strong>C\u1ed1 t\u00ednh chu vi t\u1eeb di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao.<\/strong> Thi\u1ebfu c\u1ea1nh b\u00ean th\u00ec b\u00e0i kh\u00f4ng gi\u1ea3i \u0111\u01b0\u1ee3c.<\/li>\n<li><strong>Nh\u1ea7m chu vi v\u1edbi t\u1ed5ng hai \u0111\u01b0\u1eddng ch\u00e9o.<\/strong> \u0110\u01b0\u1eddng ch\u00e9o n\u1eb1m trong h\u00ecnh, kh\u00f4ng thu\u1ed9c \u0111\u01b0\u1eddng bao.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-612274\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-4.jpg\" alt=\"chu-vi-hinh-binh-hanh-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/09\/chu-vi-hinh-binh-hanh-4-768x432.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 b\u00ecnh h\u00e0nh<\/h2>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 g\u00ec?<\/h3>\n<p>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 P = 2 \u00d7 (a + b), v\u1edbi a v\u00e0 b l\u00e0 \u0111\u1ed9 d\u00e0i hai c\u1ea1nh k\u1ec1 nhau. V\u00ec hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau n\u00ean b\u1ed1n c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 a, b, a, b.<\/p>\n<h3>C\u00e1ch t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp 4 c\u00f3 g\u00ec c\u1ea7n l\u01b0u \u00fd?<\/h3>\n<p>\u1ede l\u1edbp 4, h\u1ecdc sinh l\u00e0m ba b\u01b0\u1edbc: x\u00e1c \u0111\u1ecbnh hai c\u1ea1nh k\u1ec1 trong \u0111\u1ec1, ki\u1ec3m tra hai s\u1ed1 \u0111\u00e3 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o ch\u01b0a, r\u1ed3i t\u00ednh t\u1ed5ng hai c\u1ea1nh v\u00e0 nh\u00e2n v\u1edbi 2. B\u01b0\u1edbc hay qu\u00ean l\u00e0 nh\u00e2n 2 \u1edf cu\u1ed1i.<\/p>\n<h3>Bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 t\u00ednh \u0111\u01b0\u1ee3c chu vi kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. Di\u1ec7n t\u00edch t\u00ednh b\u1eb1ng S = a \u00d7 h, n\u00ean t\u1eeb di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao b\u1ea1n ch\u1ec9 t\u00ecm \u0111\u01b0\u1ee3c c\u1ea1nh \u0111\u00e1y a, c\u00f2n c\u1ea1nh b\u00ean b th\u00ec c\u00f4ng th\u1ee9c n\u00e0y kh\u00f4ng cho bi\u1ebft. Hai h\u00ecnh c\u00f9ng di\u1ec7n t\u00edch v\u00e0 c\u00f9ng chi\u1ec1u cao v\u1eabn c\u00f3 th\u1ec3 c\u00f3 c\u1ea1nh b\u00ean kh\u00e1c nhau n\u00ean chu vi kh\u00e1c nhau. \u0110\u1ec1 ph\u1ea3i cho th\u00eam c\u1ea1nh b\u00ean th\u00ec m\u1edbi t\u00ednh \u0111\u01b0\u1ee3c chu vi.<\/p>\n<h3>C\u1ea1nh b\u00ean v\u00e0 chi\u1ec1u cao h\u00ecnh b\u00ecnh h\u00e0nh kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3>\n<p>C\u1ea1nh b\u00ean l\u00e0 m\u1ed9t c\u1ea1nh th\u1eadt c\u1ee7a h\u00ecnh, n\u1ed1i hai \u0111\u1ec9nh li\u1ec1n nhau. Chi\u1ec1u cao l\u00e0 \u0111o\u1ea1n vu\u00f4ng g\u00f3c h\u1ea1 t\u1eeb m\u1ed9t \u0111\u1ec9nh xu\u1ed1ng c\u1ea1nh \u0111\u1ed1i di\u1ec7n. Chi\u1ec1u cao lu\u00f4n ng\u1eafn h\u01a1n ho\u1eb7c b\u1eb1ng c\u1ea1nh b\u00ean, hai gi\u00e1 tr\u1ecb ch\u1ec9 b\u1eb1ng nhau khi h\u00ecnh l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<h3>Bi\u1ebft chu vi v\u00e0 m\u1ed9t c\u1ea1nh th\u00ec t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i b\u1eb1ng c\u00e1ch n\u00e0o?<\/h3>\n<p>L\u1ea5y chu vi chia cho 2 \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u1ed5ng hai c\u1ea1nh k\u1ec1, sau \u0111\u00f3 tr\u1eeb \u0111i c\u1ea1nh \u0111\u00e3 bi\u1ebft: b = (P : 2) \u2212 a. V\u00ed d\u1ee5 chu vi 48 cm v\u00e0 m\u1ed9t c\u1ea1nh 15 cm th\u00ec c\u1ea1nh c\u00f2n l\u1ea1i b\u1eb1ng 24 \u2212 15 = 9 cm.<\/p>\n<h3>Chu vi h\u00ecnh thoi t\u00ednh nh\u01b0 h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u01b0\u1ee3c kh\u00f4ng?<\/h3>\n<p>\u0110\u01b0\u1ee3c. H\u00ecnh thoi l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, n\u00ean thay b = a v\u00e0o c\u00f4ng th\u1ee9c chung ta c\u00f3 P = 4 \u00d7 a, t\u1ee9c l\u1ea5y \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi 4.<\/p>\n<h3>V\u00ec sao ph\u1ea3i \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh?<\/h3>\n<p>V\u00ec ph\u00e9p c\u1ed9ng \u0111\u1ed9 d\u00e0i ch\u1ec9 c\u00f3 ngh\u0129a khi hai s\u1ed1 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o. N\u1ebfu \u0111\u1ec1 cho c\u1ea1nh \u0111\u00e1y 1,2 m v\u00e0 c\u1ea1nh b\u00ean 80 cm, b\u1ea1n ph\u1ea3i \u0111\u1ed5i 1,2 m th\u00e0nh 120 cm r\u1ed3i m\u1edbi c\u1ed9ng v\u1edbi 80 cm.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Chu vi h\u00ecnh b\u00ecnh h\u00e0nh t\u00ednh b\u1eb1ng P = 2 \u00d7 (a + b) v\u1edbi a v\u00e0 b l\u00e0 hai c\u1ea1nh k\u1ec1 nhau. C\u00f4ng th\u1ee9c ng\u1eafn, nh\u01b0ng mu\u1ed1n l\u00e0m \u0111\u00fang ph\u1ea3i \u0111\u1ecdc k\u1ef9 \u0111\u1ec1: x\u00e1c \u0111\u1ecbnh \u0111\u00e2u l\u00e0 c\u1ea1nh, \u0111\u00e2u l\u00e0 chi\u1ec1u cao, ki\u1ec3m tra \u0111\u01a1n v\u1ecb \u0111o v\u00e0 nh\u1edb nh\u00e2n \u0111\u00f4i \u1edf b\u01b0\u1edbc cu\u1ed1i. B\u1ea1n l\u00e0m l\u1ea1i b\u1ea3y b\u00e0i c\u00f3 l\u1eddi gi\u1ea3i c\u00f9ng b\u1ed1n b\u00e0i t\u1ef1 luy\u1ec7n ph\u00eda tr\u00ean l\u00e0 \u0111\u1ee7 quen ph\u1ea3n x\u1ea1. C\u1ea7n \u00f4n ti\u1ebfp c\u00e1c c\u00f4ng th\u1ee9c kh\u00e1c, b\u1ea1n xem th\u00eam <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-cap-so-nhan\/\">c\u00f4ng th\u1ee9c c\u1ea5p s\u1ed1 nh\u00e2n<\/a> trong chuy\u00ean m\u1ee5c to\u00e1n h\u1ecdc.<\/p>\n<p><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 b\u00ecnh h\u00e0nh l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 P = 2 \u00d7 (a + b), v\u1edbi a v\u00e0 b l\u00e0 \u0111\u1ed9 d\u00e0i hai c\u1ea1nh k\u1ec1 nhau. V\u00ec hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau n\u00ean b\u1ed1n c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 a, b, a, b.\"}},{\"@type\":\"Question\",\"name\":\"C\u00e1ch t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp 4 c\u00f3 g\u00ec c\u1ea7n l\u01b0u \u00fd?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u1ede l\u1edbp 4, h\u1ecdc sinh l\u00e0m ba b\u01b0\u1edbc: x\u00e1c \u0111\u1ecbnh hai c\u1ea1nh k\u1ec1 trong \u0111\u1ec1, ki\u1ec3m tra hai s\u1ed1 \u0111\u00e3 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o ch\u01b0a, r\u1ed3i t\u00ednh t\u1ed5ng hai c\u1ea1nh v\u00e0 nh\u00e2n v\u1edbi 2. B\u01b0\u1edbc hay qu\u00ean l\u00e0 nh\u00e2n 2 \u1edf cu\u1ed1i.\"}},{\"@type\":\"Question\",\"name\":\"Bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 t\u00ednh \u0111\u01b0\u1ee3c chu vi kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Kh\u00f4ng. Di\u1ec7n t\u00edch t\u00ednh b\u1eb1ng S = a \u00d7 h, n\u00ean t\u1eeb di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u cao b\u1ea1n ch\u1ec9 t\u00ecm \u0111\u01b0\u1ee3c c\u1ea1nh \u0111\u00e1y a, c\u00f2n c\u1ea1nh b\u00ean b th\u00ec c\u00f4ng th\u1ee9c n\u00e0y kh\u00f4ng cho bi\u1ebft. \u0110\u1ec1 ph\u1ea3i cho th\u00eam c\u1ea1nh b\u00ean th\u00ec m\u1edbi t\u00ednh \u0111\u01b0\u1ee3c chu vi.\"}},{\"@type\":\"Question\",\"name\":\"C\u1ea1nh b\u00ean v\u00e0 chi\u1ec1u cao h\u00ecnh b\u00ecnh h\u00e0nh kh\u00e1c nhau th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C\u1ea1nh b\u00ean l\u00e0 m\u1ed9t c\u1ea1nh th\u1eadt c\u1ee7a h\u00ecnh, n\u1ed1i hai \u0111\u1ec9nh li\u1ec1n nhau. Chi\u1ec1u cao l\u00e0 \u0111o\u1ea1n vu\u00f4ng g\u00f3c h\u1ea1 t\u1eeb m\u1ed9t \u0111\u1ec9nh xu\u1ed1ng c\u1ea1nh \u0111\u1ed1i di\u1ec7n. Chi\u1ec1u cao lu\u00f4n ng\u1eafn h\u01a1n ho\u1eb7c b\u1eb1ng c\u1ea1nh b\u00ean, hai gi\u00e1 tr\u1ecb ch\u1ec9 b\u1eb1ng nhau khi h\u00ecnh l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.\"}},{\"@type\":\"Question\",\"name\":\"Bi\u1ebft chu vi v\u00e0 m\u1ed9t c\u1ea1nh th\u00ec t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i b\u1eb1ng c\u00e1ch n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"L\u1ea5y chu vi chia cho 2 \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u1ed5ng hai c\u1ea1nh k\u1ec1, sau \u0111\u00f3 tr\u1eeb \u0111i c\u1ea1nh \u0111\u00e3 bi\u1ebft: b = (P : 2) \u2212 a. V\u00ed d\u1ee5 chu vi 48 cm v\u00e0 m\u1ed9t c\u1ea1nh 15 cm th\u00ec c\u1ea1nh c\u00f2n l\u1ea1i b\u1eb1ng 24 \u2212 15 = 9 cm.\"}},{\"@type\":\"Question\",\"name\":\"Chu vi h\u00ecnh thoi t\u00ednh nh\u01b0 h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u01b0\u1ee3c kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u0110\u01b0\u1ee3c. H\u00ecnh thoi l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, n\u00ean thay b = a v\u00e0o c\u00f4ng th\u1ee9c chung ta c\u00f3 P = 4 \u00d7 a, t\u1ee9c l\u1ea5y \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi 4.\"}},{\"@type\":\"Question\",\"name\":\"V\u00ec sao ph\u1ea3i \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh chu vi h\u00ecnh b\u00ecnh h\u00e0nh?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"V\u00ec ph\u00e9p c\u1ed9ng \u0111\u1ed9 d\u00e0i ch\u1ec9 c\u00f3 ngh\u0129a khi hai s\u1ed1 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o. N\u1ebfu \u0111\u1ec1 cho c\u1ea1nh \u0111\u00e1y 1,2 m v\u00e0 c\u1ea1nh b\u00ean 80 cm, b\u1ea1n ph\u1ea3i \u0111\u1ed5i 1,2 m th\u00e0nh 120 cm r\u1ed3i m\u1edbi c\u1ed9ng v\u1edbi 80 cm.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chu vi h\u00ecnh b\u00ecnh h\u00e0nh b\u1eb1ng 2 \u00d7 (a + b), trong \u0111\u00f3 a v\u00e0 b l\u00e0 \u0111\u1ed9 d\u00e0i hai c\u1ea1nh k\u1ec1 nhau. H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau n\u00ean b\u1ed1n c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 a, b, a, b. C\u1ed9ng l\u1ea1i \u0111\u01b0\u1ee3c a + b + a + b, g\u1ed9p th\u00e0nh [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":612270,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"chu vi h\u00ecnh b\u00ecnh h\u00e0nh","_yoast_wpseo_title":"Chu vi h\u00ecnh b\u00ecnh h\u00e0nh: c\u00f4ng th\u1ee9c, c\u00e1ch ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u00e0 b\u00e0i t\u1eadp","_yoast_wpseo_metadesc":"Chu vi h\u00ecnh b\u00ecnh h\u00e0nh t\u00ednh b\u1eb1ng P = 2 \u00d7 (a + b) v\u1edbi a, b l\u00e0 hai c\u1ea1nh k\u1ec1. Xem c\u00e1ch ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u1edbi chi\u1ec1u cao v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-612268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","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 b\u00ecnh h\u00e0nh: c\u00f4ng th\u1ee9c, c\u00e1ch ph\u00e2n bi\u1ec7t c\u1ea1nh b\u00ean v\u00e0 b\u00e0i t\u1eadp<\/title>\n<meta name=\"description\" content=\"Chu vi h\u00ecnh b\u00ecnh h\u00e0nh t\u00ednh b\u1eb1ng P = 2 \u00d7 (a + b) v\u1edbi a, b l\u00e0 hai c\u1ea1nh k\u1ec1. 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