{"id":532302,"date":"2026-03-21T09:03:33","date_gmt":"2026-03-21T02:03:33","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=532302"},"modified":"2026-04-17T21:16:26","modified_gmt":"2026-04-17T14:16:26","slug":"chu-vi-tam-giac-vuong","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-tam-giac-vuong\/","title":{"rendered":"Kh\u00e1m Ph\u00e1 C\u00f4ng Th\u1ee9c V\u00e0 C\u00e1ch T\u00ednh Chu Vi Tam Gi\u00e1c Vu\u00f4ng To\u00e0n Di\u1ec7n"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>Chu vi tam gi\u00e1c vu\u00f4ng<\/strong> l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i ba c\u1ea1nh trong m\u1ed9t tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng 90 \u0111\u1ed9. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong h\u00ecnh h\u1ecdc, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n v\u1ec1 di\u1ec7n t\u00edch v\u00e0 \u0111\u1ed9 d\u00e0i. \u0110\u1ec3 t\u00ednh chu vi tam gi\u00e1c vu\u00f4ng, b\u1ea1n ch\u1ec9 c\u1ea7n c\u1ed9ng chi\u1ec1u d\u00e0i hai c\u1ea1nh g\u00f3c vu\u00f4ng v\u1edbi c\u1ea1nh huy\u1ec1n. Vi\u1ec7c n\u1eafm v\u1eefng c\u00f4ng th\u1ee9c n\u00e0y gi\u00fap gi\u1ea3i quy\u1ebft nhanh ch\u00f3ng c\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn tam gi\u00e1c vu\u00f4ng trong th\u1ef1c t\u1ebf v\u00e0 h\u1ecdc t\u1eadp.<\/p>\n<h2 style=\"text-align: justify;\"><b>T\u1ed5ng quan v\u1ec1 chu vi tam gi\u00e1c: N\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chu vi c\u1ee7a m\u1ed9t h\u00ecnh tam gi\u00e1c l\u00e0 t\u1ed5ng chi\u1ec1u d\u00e0i ba c\u1ea1nh t\u1ea1o th\u00e0nh h\u00ecnh \u0111\u00f3. D\u00f9 l\u00e0 tam gi\u00e1c th\u01b0\u1eddng, tam gi\u00e1c c\u00e2n hay tam gi\u00e1c vu\u00f4ng, c\u00e1ch t\u00ednh chu vi \u0111\u1ec1u b\u1eaft \u0111\u1ea7u t\u1eeb c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi tam gi\u00e1c l\u00e0 g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><b>Chu vi h\u00ecnh tam gi\u00e1c l\u00e0<\/b><span style=\"font-weight: 400;\"> \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao quanh h\u00ecnh tam gi\u00e1c \u2013 n\u00f3i c\u00e1ch kh\u00e1c, l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i ba c\u1ea1nh. \u0110\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m c\u0103n b\u1ea3n trong to\u00e1n h\u1ecdc v\u00e0 l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 gi\u1ea3i quy\u1ebft nhi\u1ec1u d\u1ea1ng b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh tam gi\u00e1c<\/b><\/h3>\n<p style=\"text-align: justify;\"><b>P = a + b + c<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong \u0111\u00f3:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><b>a, b, c:<\/b><span style=\"font-weight: 400;\"> l\u00e0 \u0111\u1ed9 d\u00e0i 3 c\u1ea1nh c\u1ee7a tam gi\u00e1c<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>P:<\/b><span style=\"font-weight: 400;\"> l\u00e0 chu vi (\u0111\u01a1n v\u1ecb c\u00f9ng v\u1edbi c\u00e1c c\u1ea1nh, v\u00ed d\u1ee5: cm, m, mm,&#8230;)<\/span><\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-532389\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-1.jpg\" alt=\"chu-vi-tam-giac-vuong-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>V\u00ed d\u1ee5 minh h\u1ecda<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Cho tam gi\u00e1c ABC c\u00f3 c\u00e1c c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 5 cm, 7 cm v\u00e0 8 cm. H\u1ecfi chu vi tam gi\u00e1c n\u00e0y l\u00e0 bao nhi\u00eau?<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><b>Gi\u1ea3i:<\/b><span style=\"font-weight: 400;\"> P = 5 + 7 + 8 = <\/span><b>20 cm<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Nh\u01b0 v\u1eady, d\u00f9 tam gi\u00e1c c\u00f3 d\u1ea1ng g\u00ec, ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i 3 c\u1ea1nh l\u00e0 b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c chu vi.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00e1c tr\u01b0\u1eddng h\u1ee3p t\u00ednh chu vi tam gi\u00e1c vu\u00f4ng kh\u00e1c<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu bi\u1ebft c\u1ea1nh huy\u1ec1n v\u00e0 m\u1ed9t c\u1ea1nh g\u00f3c vu\u00f4ng, d\u00f9ng Pytago \u0111\u1ec3 t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i: a = \u221a(c\u00b2 &#8211; b\u00b2).<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu bi\u1ebft m\u1ed9t c\u1ea1nh v\u00e0 m\u1ed9t g\u00f3c (kh\u00f4ng ph\u1ea3i g\u00f3c vu\u00f4ng), c\u00f3 th\u1ec3 d\u00f9ng l\u01b0\u1ee3ng gi\u00e1c \u0111\u1ec3 t\u00ecm c\u00e1c c\u1ea1nh c\u00f2n l\u1ea1i tr\u01b0\u1edbc khi t\u00ednh chu vi.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><i><span style=\"font-weight: 400;\">L\u01b0u \u00fd:<\/span><\/i><span style=\"font-weight: 400;\"> \u1ede b\u1eadc ti\u1ec3u h\u1ecdc, \u0111a ph\u1ea7n b\u00e0i to\u00e1n y\u00eau c\u1ea7u t\u00ednh chu vi khi bi\u1ebft 2 c\u1ea1nh, c\u00f2n \u1edf c\u1ea5p 2 v\u00e0 3, b\u00e0i to\u00e1n c\u00f3 th\u1ec3 ph\u1ee9c t\u1ea1p h\u01a1n, \u0111\u00f2i h\u1ecfi k\u1ebft h\u1ee3p ki\u1ebfn th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c, \u0111\u1ecbnh l\u00fd cosin, sin,&#8230;<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e1c lo\u1ea1i tam gi\u00e1c vu\u00f4ng \u0111\u1eb7c bi\u1ec7t v\u00e0 chu vi<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ngo\u00e0i tam gi\u00e1c vu\u00f4ng th\u00f4ng th\u01b0\u1eddng, c\u00f2n c\u00f3 c\u00e1c lo\u1ea1i \u0111\u1eb7c bi\u1ec7t nh\u01b0 tam gi\u00e1c vu\u00f4ng c\u00e2n ho\u1eb7c c\u00f3 g\u00f3c \u0111\u1eb7c bi\u1ec7t. M\u1ed7i lo\u1ea1i n\u00e0y l\u1ea1i c\u00f3 c\u00e1ch t\u00ednh chu vi v\u1edbi \u0111\u1eb7c th\u00f9 ri\u00eang, nh\u01b0ng \u0111\u1ec1u d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c chung v\u00e0 \u00e1p d\u1ee5ng th\u00eam c\u00e1c t\u00ednh ch\u1ea5t \u0111\u1eb7c bi\u1ec7t.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi tam gi\u00e1c vu\u00f4ng c\u00e2n<\/b><\/h3>\n<p style=\"text-align: justify;\"><b>Tam gi\u00e1c vu\u00f4ng c\u00e2n<\/b><span style=\"font-weight: 400;\"> l\u00e0 tam gi\u00e1c vu\u00f4ng m\u00e0 hai c\u1ea1nh g\u00f3c vu\u00f4ng b\u1eb1ng nhau (a = b). Khi \u0111\u00f3:<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u1ea1nh huy\u1ec1n c = a\u221a2<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chu vi: P = a + a + a\u221a2 = a(2 + \u221a2)<\/span><\/p>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tam gi\u00e1c vu\u00f4ng c\u00e2n c\u1ea1nh g\u00f3c vu\u00f4ng a = 5 cm.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Chu vi = 5 \u00d7 (2 + \u221a2) \u2248 5 \u00d7 3.414 \u2248 <\/span><b>17.07 cm<\/b><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-532388\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-2.jpg\" alt=\"chu-vi-tam-giac-vuong-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi tam gi\u00e1c vu\u00f4ng c\u00f3 g\u00f3c \u0111\u1eb7c bi\u1ec7t (30\u00b0, 45\u00b0, 60\u00b0)<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><b>G\u00f3c 45\u00b0:<\/b><span style=\"font-weight: 400;\"> Ch\u00ednh l\u00e0 tam gi\u00e1c vu\u00f4ng c\u00e2n (\u0111\u00e3 tr\u00ecnh b\u00e0y \u1edf tr\u00ean).<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>G\u00f3c 30\u00b0 ho\u1eb7c 60\u00b0:<\/b>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Khi bi\u1ebft c\u1ea1nh \u0111\u1ed1i di\u1ec7n g\u00f3c 30\u00b0 l\u00e0 a, c\u1ea1nh huy\u1ec1n s\u1ebd l\u00e0 2a, c\u1ea1nh c\u00f2n l\u1ea1i l\u00e0 a\u221a3.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Chu vi:<\/b><span style=\"font-weight: 400;\"> P = a + a\u221a3 + 2a = a(3 + \u221a3)<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tam gi\u00e1c vu\u00f4ng c\u00f3 g\u00f3c 30\u00b0, c\u1ea1nh \u0111\u1ed1i di\u1ec7n g\u00f3c 30\u00b0 l\u00e0 4 cm.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C\u1ea1nh huy\u1ec1n = 8 cm, c\u1ea1nh c\u00f2n l\u1ea1i = 4\u221a3 \u2248 6.93 cm<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Chu vi = 4 + 6.93 + 8 \u2248 <\/span><b>18.93 cm<\/b><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi tam gi\u00e1c vu\u00f4ng c\u00f3 c\u00e1c c\u1ea1nh b\u1eb1ng nhau?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tam gi\u00e1c vu\u00f4ng kh\u00f4ng th\u1ec3 c\u00f3 ba c\u1ea1nh b\u1eb1ng nhau, nh\u01b0ng c\u00f3 th\u1ec3 c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng b\u1eb1ng nhau (tam gi\u00e1c vu\u00f4ng c\u00e2n).<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi tam gi\u00e1c vu\u00f4ng Pitago<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Nhi\u1ec1u b\u00e0i to\u00e1n cho tam gi\u00e1c vu\u00f4ng v\u1edbi c\u00e1c b\u1ed9 ba s\u1ed1 Pitago n\u1ed5i ti\u1ebfng (3-4-5, 5-12-13,&#8230;). Ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t \u0111\u1ec3 t\u00ednh chu vi nh\u01b0 b\u00ecnh th\u01b0\u1eddng.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>B\u1ed9 ba Pitago<\/b><\/td>\n<td><b>Chu vi<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3, 4, 5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3 + 4 + 5 = 12<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">5, 12, 13<\/span><\/td>\n<td><span style=\"font-weight: 400;\">5 + 12 + 13 = 30<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">8, 15, 17<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8 + 15 + 17 = 40<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"text-align: justify;\"><b>So s\u00e1nh v\u00e0 \u1ee9ng d\u1ee5ng chu vi tam gi\u00e1c vu\u00f4ng trong th\u1ef1c t\u1ebf<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chu vi tam gi\u00e1c c\u00f3 nguy\u00ean t\u1eafc t\u00ednh gi\u1ed1ng tam gi\u00e1c th\u01b0\u1eddng, nh\u01b0ng nh\u1edd \u0111\u1eb7c \u0111i\u1ec3m vu\u00f4ng g\u00f3c, nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 thu\u1eadn ti\u1ec7n h\u01a1n.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>So s\u00e1nh chu vi tam gi\u00e1c kh\u00e1c nhau<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><b>Tam gi\u00e1c \u0111\u1ec1u<\/b><span style=\"font-weight: 400;\">: Ba c\u1ea1nh b\u1eb1ng nhau, chu vi = 3a.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Tam gi\u00e1c c\u00e2n<\/b><span style=\"font-weight: 400;\">: Hai c\u1ea1nh b\u1eb1ng nhau, chu vi = 2a + b.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Tam gi\u00e1c vu\u00f4ng<\/b><span style=\"font-weight: 400;\">: Hai c\u1ea1nh vu\u00f4ng, c\u1ea1nh huy\u1ec1n, chu vi = a + b + c (c\u00f3 th\u1ec3 t\u00ednh c b\u1eb1ng Pytago).<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Tam gi\u00e1c nh\u1ecdn\/t\u00f9<\/b><span style=\"font-weight: 400;\">: \u00c1p d\u1ee5ng t\u1ed5ng qu\u00e1t c\u00f4ng th\u1ee9c chu vi nh\u01b0ng kh\u00f4ng c\u00f3 t\u00ednh ch\u1ea5t \u0111\u1eb7c bi\u1ec7t nh\u01b0 tam gi\u00e1c vu\u00f4ng.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>So v\u1edbi t\u1ee9 gi\u00e1c:<\/b><span style=\"font-weight: 400;\"> C\u00f4ng th\u1ee9c chu vi h\u00ecnh t\u1ee9 gi\u00e1c l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh, c\u00e1ch t\u00ednh ph\u1ee9c t\u1ea1p h\u01a1n n\u1ebfu kh\u00f4ng bi\u1ebft h\u1ebft c\u00e1c c\u1ea1nh.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-532386\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-4.jpg\" alt=\"chu-vi-tam-giac-vuong-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a chu vi tam gi\u00e1c\u00a0<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u0110o \u0111\u1ea1c x\u00e2y d\u1ef1ng (l\u00e0m m\u00f3ng nh\u00e0, \u0111o \u0111\u1ea5t, chia l\u00f4&#8230;)<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Ch\u1ebf t\u1ea1o v\u1eadt li\u1ec7u (g\u1ed7, k\u00ednh, v\u1ea3i&#8230;) theo k\u00edch th\u01b0\u1edbc h\u00ecnh h\u1ecdc<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u00e0i to\u00e1n th\u1ef1c t\u1ebf trong \u0111\u1eddi s\u1ed1ng, v\u00ed d\u1ee5 x\u00e1c \u0111\u1ecbnh d\u00e2y \u0111i\u1ec7n bao quanh khu v\u1ef1c h\u00ecnh tam gi\u00e1c vu\u00f4ng<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n th\u1ef1c h\u00e0nh, b\u00e0i to\u00e1n n\u00e2ng cao trong h\u1ecdc t\u1eadp<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>B\u00e0i t\u1eadp m\u1eabu:<\/b><span style=\"font-weight: 400;\"> M\u1ed9t mi\u1ebfng \u0111\u1ea5t h\u00ecnh tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng d\u00e0i 12m v\u00e0 16m. H\u1ecfi c\u1ea7n bao nhi\u00eau m\u00e9t d\u00e2y \u0111\u1ec3 qu\u00e2y quanh mi\u1ebfng \u0111\u1ea5t n\u00e0y?<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">Gi\u1ea3i:<\/span><\/i><span style=\"font-weight: 400;\"> C\u1ea1nh huy\u1ec1n = \u221a(12\u00b2 + 16\u00b2) = \u221a(144 + 256) = \u221a400 = 20m. Chu vi = 12 + 16 + 20 = <\/span><b>48m<\/b><\/p>\n<h2 style=\"text-align: justify;\"><b>Chu vi v\u00e0 di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng: So s\u00e1nh v\u00e0 b\u00e0i to\u00e1n k\u1ebft h\u1ee3p<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chu vi v\u00e0 di\u1ec7n t\u00edch l\u00e0 hai kh\u00e1i ni\u1ec7m kh\u00e1c nhau nh\u01b0ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c h\u1ecfi k\u1ebft h\u1ee3p trong c\u00e1c b\u00e0i to\u00e1n v\u1ec1 tam gi\u00e1c vu\u00f4ng. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u1ea3 hai s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i quy\u1ebft tr\u1ecdn v\u1eb9n c\u00e1c y\u00eau c\u1ea7u t\u1eeb l\u00fd thuy\u1ebft \u0111\u1ebfn th\u1ef1c t\u1ebf.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (a \u00d7 b) \/ 2<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">a, b: hai c\u1ea1nh g\u00f3c vu\u00f4ng<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S: di\u1ec7n t\u00edch (\u0111\u01a1n v\u1ecb: m\u00b2, cm\u00b2, mm\u00b2,&#8230;)<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng 9 cm v\u00e0 12 cm.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch S = (9 \u00d7 12) \/ 2 = 108 \/ 2 = <\/span><b>54 cm\u00b2<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-532387\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-3.jpg\" alt=\"chu-vi-tam-giac-vuong-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/03\/chu-vi-tam-giac-vuong-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>B\u00e0i to\u00e1n ph\u1ed1i h\u1ee3p t\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch<\/b><\/h3>\n<p style=\"text-align: justify;\"><b>B\u00e0i to\u00e1n:<\/b><span style=\"font-weight: 400;\"> Tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 7 cm v\u00e0 24 cm. T\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><b>Gi\u1ea3i:<\/b><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">C\u1ea1nh huy\u1ec1n: c = \u221a(7\u00b2 + 24\u00b2) = \u221a(49 + 576) = \u221a625 = 25 cm<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Chu vi: P = 7 + 24 + 25 = <\/span><b>56 cm<\/b><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch: S = (7 \u00d7 24) \/ 2 = 168 \/ 2 = <\/span><b>84 cm\u00b2<\/b><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/b><\/h2>\n<h3 style=\"text-align: justify;\"><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ednh chu vi tam gi\u00e1c vu\u00f4ng khi ch\u1ec9 bi\u1ebft hai c\u1ea1nh g\u00f3c vu\u00f4ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u1ea1n \u00e1p d\u1ee5ng \u0111\u1ecbnh l\u00fd Pytago \u0111\u1ec3 t\u00ednh c\u1ea1nh huy\u1ec1n: c = \u221a(a\u00b2 + b\u00b2), sau \u0111\u00f3 c\u1ed9ng ba c\u1ea1nh l\u1ea1i: P = a + b + c.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f3 th\u1ec3 c\u00f3 tam gi\u00e1c vu\u00f4ng \u0111\u1ec1u kh\u00f4ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3. Tam gi\u00e1c \u0111\u1ec1u c\u00f3 ba c\u1ea1nh v\u00e0 ba g\u00f3c b\u1eb1ng nhau, c\u00f2n tam gi\u00e1c vu\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t g\u00f3c 90\u00b0 n\u00ean kh\u00f4ng th\u1ec3 \u0111\u1ec1u.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Mu\u1ed1n t\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng c\u1ea7n bi\u1ebft g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i hai c\u1ea1nh g\u00f3c vu\u00f4ng (ho\u1eb7c c\u00f3 th\u1ec3 suy ra c\u1ea1nh huy\u1ec1n). Chu vi t\u00ednh theo P = a + b + c, di\u1ec7n t\u00edch S = (a \u00d7 b) \/ 2.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>M\u1ed9t s\u1ed1 b\u1ed9 ba s\u1ed1 Pitago th\u01b0\u1eddng g\u1eb7p \u0111\u1ec3 t\u00ednh chu vi tam gi\u00e1c l\u00e0 g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00e1c b\u1ed9 ba Pitago ph\u1ed5 bi\u1ebfn g\u1ed3m: 3-4-5, 5-12-13, 8-15-17,&#8230; Ch\u1ec9 c\u1ea7n c\u1ed9ng c\u00e1c s\u1ed1 n\u00e0y l\u1ea1i \u0111\u1ec3 ra chu vi.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Xem th\u00eam:<\/b><\/p>\n<ul>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><span style=\"color: #339966;\"><strong><a style=\"color: #339966;\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/giai-ma-hinh-tam-giac-co-tam-doi-xung-hay-khong\/\">Gi\u1ea3i M\u00e3: H\u00ecnh Tam Gi\u00e1c C\u00f3 T\u00e2m \u0110\u1ed1i X\u1ee9ng Hay Kh\u00f4ng?<\/a><\/strong><\/span><\/p>\n<\/li>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><span style=\"color: #339966;\"><strong><a style=\"color: #339966;\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tia-phan-giac-la-gi\/\">Tia ph\u00e2n gi\u00e1c l\u00e0 g\u00ec? \u0110\u01b0\u1eddng ph\u00e2n gi\u00e1c l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a tam gi\u00e1c<\/a><\/strong><\/span><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Chu vi tam gi\u00e1c vu\u00f4ng l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i ba c\u1ea1nh trong m\u1ed9t tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng 90 \u0111\u1ed9. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong h\u00ecnh h\u1ecdc, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n v\u1ec1 di\u1ec7n t\u00edch v\u00e0 \u0111\u1ed9 d\u00e0i. \u0110\u1ec3 t\u00ednh chu vi tam gi\u00e1c vu\u00f4ng, [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":532391,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-532302","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>C\u00f4ng Th\u1ee9c V\u00e0 C\u00e1ch T\u00ednh Chu Vi Tam Gi\u00e1c Vu\u00f4ng To\u00e0n Di\u1ec7n<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n c\u00e1ch t\u00ednh chu vi tam gi\u00e1c vu\u00f4ng, k\u00e8m v\u00ed d\u1ee5 minh h\u1ecda r\u00f5 r\u00e0ng. 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