{"id":567139,"date":"2026-07-22T09:25:53","date_gmt":"2026-07-22T02:25:53","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=567139"},"modified":"2026-07-22T09:25:53","modified_gmt":"2026-07-22T02:25:53","slug":"dien-tich-hinh-thoi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-thoi\/","title":{"rendered":"Di\u1ec7n t\u00edch h\u00ecnh thoi: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh v\u00e0 v\u00ed d\u1ee5"},"content":{"rendered":"<p style=\"text-align: justify;\"><b>Di\u1ec7n t\u00edch h\u00ecnh thoi<\/b><span style=\"font-weight: 400;\"> b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o, t\u00ednh theo c\u00f4ng th\u1ee9c S = (d\u2081 \u00d7 d\u2082) \/ 2. Ngo\u00e0i ra, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi c\u00f2n \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u1ea1nh \u0111\u00e1y nh\u00e2n v\u1edbi chi\u1ec1u cao (S = a \u00d7 h). \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc quan tr\u1ecdng c\u1ee7a To\u00e1n ti\u1ec3u h\u1ecdc v\u00e0 THCS. B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y h\u00ecnh thoi l\u00e0 g\u00ec, t\u00ednh ch\u1ea5t, hai c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch, c\u00f4ng th\u1ee9c chu vi, v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>H\u00ecnh thoi l\u00e0 g\u00ec?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau. H\u00ecnh thoi c\u0169ng l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, n\u00ean n\u00f3 mang \u0111\u1ea7y \u0111\u1ee7 t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh v\u00e0 c\u00f3 th\u00eam nh\u1eefng t\u00ednh ch\u1ea5t ri\u00eang. H\u00ecnh vu\u00f4ng ch\u00ednh l\u00e0 m\u1ed9t h\u00ecnh thoi \u0111\u1eb7c bi\u1ec7t c\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh thoi<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi l\u00e0 m\u1ed9t t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t c\u00f3 nhi\u1ec1u t\u00ednh ch\u1ea5t quan tr\u1ecdng, gi\u00fap nh\u1eadn bi\u1ebft v\u00e0 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh thoi g\u1ed3m:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u1ed1n c\u1ea1nh b\u1eb1ng nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a c\u00e1c g\u00f3c trong h\u00ecnh thoi.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c c\u1ea1nh \u0111\u1ed1i song song v\u00e0 c\u00e1c g\u00f3c \u0111\u1ed1i b\u1eb1ng nhau, gi\u1ed1ng nh\u01b0 t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Nh\u1edd nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m tr\u00ean, h\u00ecnh thoi v\u1eeba c\u00f3 t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, v\u1eeba c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ri\u00eang nh\u01b0 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau v\u00e0 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-568226\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-1-1.jpg\" alt=\"dien-tich-hinh-thoi-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-1-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-1-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-1-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi c\u00f3 th\u1ec3 t\u00ednh di\u1ec7n t\u00edch theo hai c\u00e1ch:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Theo hai \u0111\u01b0\u1eddng ch\u00e9o: S = (d\u2081 \u00d7 d\u2082) \/ 2. Trong \u0111\u00f3, d\u2081 v\u00e0 d\u2082 l\u00e0 \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Theo c\u1ea1nh v\u00e0 chi\u1ec1u cao: S = a \u00d7 h. Trong \u0111\u00f3, a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh, h l\u00e0 chi\u1ec1u cao.<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>V\u00ed d\u1ee5 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">V\u00ed d\u1ee5:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 1: H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o 6 cm v\u00e0 8 cm. Di\u1ec7n t\u00edch: S = (6 \u00d7 8) \/ 2 = 24 cm\u00b2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 2: H\u00ecnh thoi c\u00f3 c\u1ea1nh 5 cm, chi\u1ec1u cao 4 cm. Di\u1ec7n t\u00edch: S = 5 \u00d7 4 = 20 cm\u00b2.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 1: Hai \u0111\u01b0\u1eddng ch\u00e9o d\u00e0i 10 cm v\u00e0 12 cm. S = (10 \u00d7 12) \/ 2 = 60 cm\u00b2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 2: H\u00ecnh thoi c\u00f3 di\u1ec7n t\u00edch 40 cm\u00b2, m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o d\u00e0i 8 cm. \u0110\u01b0\u1eddng ch\u00e9o c\u00f2n l\u1ea1i: d = (2 \u00d7 40) \/ 8 = 10 cm.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 3: H\u00ecnh thoi c\u00f3 c\u1ea1nh 6 cm, chi\u1ec1u cao 4,5 cm. Di\u1ec7n t\u00edch: S = 6 \u00d7 4,5 = 27 cm\u00b2. Chu vi: P = 4 \u00d7 6 = 24 cm.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 4: H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o 14 cm v\u00e0 5 cm. Di\u1ec7n t\u00edch: S = (14 \u00d7 5) \/ 2 = 35 cm\u00b2. \u0110\u00e1p \u00e1n: B. 35 cm\u00b2<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 5: M\u1ea3nh v\u01b0\u1eddn h\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o 20 m v\u00e0 15 m. Di\u1ec7n t\u00edch: S = (20 \u00d7 15) \/ 2 = 150 m\u00b2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i 6: H\u00ecnh thoi c\u00f3 di\u1ec7n t\u00edch 48 cm\u00b2, chi\u1ec1u cao 6 cm. C\u1ea1nh h\u00ecnh thoi: a = 48 \u00f7 6 = 8 cm.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-568225\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-2.jpg\" alt=\"dien-tich-hinh-thoi-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>V\u00ec sao di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi S = (d\u2081 \u00d7 d\u2082) \/ 2 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch d\u1ef1a tr\u00ean \u0111\u1eb7c \u0111i\u1ec3m \u0111\u1eb7c bi\u1ec7t c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o. Trong h\u00ecnh thoi, hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng, t\u1eeb \u0111\u00f3 chia h\u00ecnh thoi th\u00e0nh 4 tam gi\u00e1c vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch b\u1eb1ng nhau.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">M\u1ed7i tam gi\u00e1c vu\u00f4ng c\u00f3 hai c\u1ea1nh g\u00f3c vu\u00f4ng l\u1ea7n l\u01b0\u1ee3t b\u1eb1ng m\u1ed9t n\u1eeda \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o, t\u1ee9c l\u00e0 d\u2081\/2 v\u00e0 d\u2082\/2. V\u00ec v\u1eady, t\u1ed5ng di\u1ec7n t\u00edch c\u1ee7a 4 tam gi\u00e1c l\u00e0: 4 \u00d7 [\u00bd \u00d7 (d\u2081\/2) \u00d7 (d\u2082\/2)] = (d\u2081 \u00d7 d\u2082) \/ 2<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Do \u0111\u00f3, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o. \u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n, d\u1ec5 \u00e1p d\u1ee5ng khi bi\u1ebft \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p v\u1ec1 h\u00ecnh thoi<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Khi h\u1ecdc v\u1ec1 <\/span><b>di\u1ec7n t\u00edch h\u00ecnh thoi,<\/b><span style=\"font-weight: 400;\"> h\u1ecdc sinh th\u01b0\u1eddng g\u1eb7p m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp c\u01a1 b\u1ea3n. M\u1ed7i d\u1ea1ng ch\u1ec9 c\u1ea7n x\u00e1c \u0111\u1ecbnh \u0111\u00fang d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i cho v\u00e0 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c ph\u00f9 h\u1ee3p.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00e1c d\u1ea1ng th\u01b0\u1eddng g\u1eb7p g\u1ed3m:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ea1ng 1: T\u00ednh di\u1ec7n t\u00edch khi bi\u1ebft hai \u0111\u01b0\u1eddng ch\u00e9o \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c S = (d\u2081 \u00d7 d\u2082) \/ 2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ea1ng 2: T\u00ecm \u0111\u01b0\u1eddng ch\u00e9o c\u00f2n l\u1ea1i khi bi\u1ebft di\u1ec7n t\u00edch v\u00e0 m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o Bi\u1ebfn \u0111\u1ed5i c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch \u0111\u1ec3 t\u00ecm \u0111\u01b0\u1eddng ch\u00e9o ch\u01b0a bi\u1ebft.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ea1ng 3: T\u00ednh di\u1ec7n t\u00edch khi bi\u1ebft c\u1ea1nh v\u00e0 chi\u1ec1u cao S\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c S = a \u00d7 h.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ea1ng 4: B\u00e0i to\u00e1n th\u1ef1c t\u1ebf v\u1ec1 h\u00ecnh thoi \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c v\u00e0o c\u00e1c t\u00ecnh hu\u1ed1ng nh\u01b0 t\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t, h\u1ecda ti\u1ebft trang tr\u00ed ho\u1eb7c c\u00e1c v\u1eadt c\u00f3 d\u1ea1ng h\u00ecnh thoi.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-568224\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-3.jpg\" alt=\"dien-tich-hinh-thoi-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-hinh-thoi-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>Ph\u00e2n bi\u1ec7t h\u00ecnh thoi v\u00e0 h\u00ecnh vu\u00f4ng<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi v\u00e0 h\u00ecnh vu\u00f4ng \u0111\u1ec1u c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, nh\u01b0ng h\u00ecnh vu\u00f4ng c\u00f3 th\u00eam b\u1ed1n g\u00f3c vu\u00f4ng. N\u00f3i c\u00e1ch kh\u00e1c, m\u1ecdi h\u00ecnh vu\u00f4ng \u0111\u1ec1u l\u00e0 h\u00ecnh thoi, nh\u01b0ng kh\u00f4ng ph\u1ea3i h\u00ecnh thoi n\u00e0o c\u0169ng l\u00e0 h\u00ecnh vu\u00f4ng. V\u1edbi h\u00ecnh vu\u00f4ng, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau; c\u00f2n h\u00ecnh thoi th\u01b0\u1eddng c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o kh\u00e1c nhau.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh thoi<\/b><\/h2>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0 g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (d\u2081 \u00d7 d\u2082)\/2, b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o; ho\u1eb7c S = a \u00d7 h (c\u1ea1nh \u0111\u00e1y nh\u00e2n chi\u1ec1u cao).<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o 6 cm v\u00e0 8 cm l\u00e0 bao nhi\u00eau?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (6 \u00d7 8)\/2 = 24 cm\u00b2.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Chu vi h\u00ecnh thoi t\u00ednh th\u1ebf n\u00e0o?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">P = 4 \u00d7 a, v\u1edbi a l\u00e0 \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh thoi.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>H\u00ecnh thoi kh\u00e1c h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u1ea3 hai c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, nh\u01b0ng h\u00ecnh vu\u00f4ng c\u00f3 th\u00eam b\u1ed1n g\u00f3c vu\u00f4ng v\u00e0 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00e1ch t\u00ecm \u0111\u01b0\u1eddng ch\u00e9o khi bi\u1ebft di\u1ec7n t\u00edch?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u1eeb S = (d\u2081 \u00d7 d\u2082)\/2 suy ra d\u2082 = 2S \/ d\u2081.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>K\u1ebft lu\u1eadn<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u00f3m l\u1ea1i,<\/span><b> di\u1ec7n t\u00edch h\u00ecnh thoi <\/b><span style=\"font-weight: 400;\">b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o S = (d\u2081 \u00d7 d\u2082)\/2, ho\u1eb7c b\u1eb1ng c\u1ea1nh \u0111\u00e1y nh\u00e2n chi\u1ec1u cao S = a \u00d7 h. Ghi nh\u1edb th\u00eam chu vi P = 4a v\u00e0 luy\u1ec7n t\u1eadp b\u00e0i t\u1eadp s\u1ebd gi\u00fap b\u1ea1n th\u00e0nh th\u1ea1o d\u1ea1ng to\u00e1n n\u00e0y. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tinh-chat-cua-hinh-thoi\/\"> <span style=\"font-weight: 400;\">t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh thoi<\/span><\/a><span style=\"font-weight: 400;\">,<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-tam-giac\/\"> <span style=\"font-weight: 400;\">c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c<\/span><\/a><span style=\"font-weight: 400;\"> v\u00e0<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-tron\/\"> <span style=\"font-weight: 400;\">c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/span><\/a><span style=\"font-weight: 400;\"> tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.\u00a0<\/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\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-to-hop-chinh-hop\/\">B\u1ed9 c\u00f4ng th\u1ee9c Ho\u00e1n v\u1ecb \u2013 Ch\u1ec9nh h\u1ee3p \u2013 T\u1ed5 h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t trong To\u00e1n h\u1ecdc<\/a><\/p>\n<\/li>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/so-thuc-la-gi\/\">S\u1ed1 th\u1ef1c l\u00e0 g\u00ec? M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n h\u1ecdc ph\u1ed5 bi\u1ebfn v\u1ec1 s\u1ed1 th\u1ef1c<\/a><\/p>\n<\/li>\n<\/ul>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S = (d\u2081 \u00d7 d\u2082)\/2, b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o; ho\u1eb7c S = a \u00d7 h (c\u1ea1nh \u0111\u00e1y nh\u00e2n chi\u1ec1u cao).\"}},{\"@type\":\"Question\",\"name\":\"Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o 6 cm v\u00e0 8 cm l\u00e0 bao nhi\u00eau?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S = (6 \u00d7 8)\/2 = 24 cm\u00b2.\"}},{\"@type\":\"Question\",\"name\":\"Chu vi h\u00ecnh thoi t\u00ednh th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"P = 4 \u00d7 a, v\u1edbi a l\u00e0 \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh thoi.\"}},{\"@type\":\"Question\",\"name\":\"H\u00ecnh thoi kh\u00e1c h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C\u1ea3 hai c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau, nh\u01b0ng h\u00ecnh vu\u00f4ng c\u00f3 th\u00eam b\u1ed1n g\u00f3c vu\u00f4ng v\u00e0 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.\"}},{\"@type\":\"Question\",\"name\":\"C\u00e1ch t\u00ecm \u0111\u01b0\u1eddng ch\u00e9o khi bi\u1ebft di\u1ec7n t\u00edch?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"T\u1eeb S = (d\u2081 \u00d7 d\u2082)\/2 suy ra d\u2082 = 2S \/ d\u2081.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o, t\u00ednh theo c\u00f4ng th\u1ee9c S = (d\u2081 \u00d7 d\u2082) \/ 2. Ngo\u00e0i ra, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi c\u00f2n \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u1ea1nh \u0111\u00e1y nh\u00e2n v\u1edbi chi\u1ec1u cao (S = a \u00d7 h). \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc quan tr\u1ecdng c\u1ee7a [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":568223,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"di\u1ec7n t\u00edch h\u00ecnh thoi","_yoast_wpseo_title":"Di\u1ec7n t\u00edch h\u00ecnh thoi: c\u00f4ng th\u1ee9c v\u00e0 v\u00ed d\u1ee5","_yoast_wpseo_metadesc":"Di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o: S = (d\u2081 \u00d7 d\u2082)\/2. H\u01b0\u1edbng d\u1eabn c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh k\u00e8m v\u00ed d\u1ee5 v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-567139","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>Di\u1ec7n t\u00edch h\u00ecnh thoi: c\u00f4ng th\u1ee9c v\u00e0 v\u00ed d\u1ee5<\/title>\n<meta name=\"description\" content=\"Di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o: S = (d\u2081 \u00d7 d\u2082)\/2. 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