{"id":298328,"date":"2023-12-20T19:59:43","date_gmt":"2023-12-20T12:59:43","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=298328"},"modified":"2026-11-05T14:01:32","modified_gmt":"2026-11-05T07:01:32","slug":"dien-tich-hinh-vuong","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/","title":{"rendered":"C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng: C\u00f4ng th\u1ee9c, v\u00ed d\u1ee5 v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p"},"content":{"rendered":"<p><strong>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3: S = a \u00d7 a = a\u00b2.<\/strong> V\u00ed d\u1ee5 h\u00ecnh vu\u00f4ng c\u1ea1nh 5 cm c\u00f3 di\u1ec7n t\u00edch S = 5 \u00d7 5 = 25 cm\u00b2. N\u1ebfu ch\u1ec9 bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o d th\u00ec S = d\u00b2 : 2; n\u1ebfu bi\u1ebft chu vi P th\u00ec t\u00ecm c\u1ea1nh a = P : 4 r\u1ed3i b\u00ecnh ph\u01b0\u01a1ng. B\u00e0i vi\u1ebft h\u01b0\u1edbng d\u1eabn \u0111\u1ee7 ba c\u00e1ch t\u00ednh, k\u00e8m d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng, l\u01b0u \u00fd v\u1ec1 \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i.<\/p>\n<p><strong>T\u00f3m t\u1eaft nhanh:<\/strong><\/p>\n<ul>\n<li><strong>Bi\u1ebft c\u1ea1nh:<\/strong> S = a \u00d7 a.<\/li>\n<li><strong>Bi\u1ebft chu vi:<\/strong> a = P : 4, r\u1ed3i S = a \u00d7 a.<\/li>\n<li><strong>Bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o:<\/strong> S = d \u00d7 d : 2 (b\u1eb1ng n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o, kh\u00f4ng ph\u1ea3i t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o).<\/li>\n<li><strong>\u0110\u01a1n v\u1ecb:<\/strong> c\u1ea1nh \u0111o b\u1eb1ng cm th\u00ec di\u1ec7n t\u00edch l\u00e0 cm\u00b2; \u0111\u1ed5i m\u1ecdi s\u1ed1 \u0111o v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh.<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-298330 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-1.jpg\" alt=\"H\u00ecnh vu\u00f4ng ABCD c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau v\u00e0 b\u1ed1n g\u00f3c vu\u00f4ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>H\u00ecnh vu\u00f4ng l\u00e0 g\u00ec?<\/h2>\n<p>H\u00ecnh vu\u00f4ng l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau v\u00e0 b\u1ed1n g\u00f3c vu\u00f4ng. V\u00ec v\u1eady h\u00ecnh vu\u00f4ng v\u1eeba l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1eb7c bi\u1ec7t (c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau), v\u1eeba l\u00e0 h\u00ecnh thoi \u0111\u1eb7c bi\u1ec7t (c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng).<\/p>\n<h3>T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng<\/h3>\n<ul>\n<li>B\u1ed1n c\u1ea1nh b\u1eb1ng nhau, c\u00e1c c\u1ea1nh \u0111\u1ed1i song song.<\/li>\n<li>B\u1ed1n g\u00f3c \u0111\u1ec1u b\u1eb1ng 90\u00b0.<\/li>\n<li>Hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau, vu\u00f4ng g\u00f3c v\u1edbi nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng.<\/li>\n<li>M\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau.<\/li>\n<li>Giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 t\u00e2m c\u1ee7a c\u1ea3 \u0111\u01b0\u1eddng tr\u00f2n n\u1ed9i ti\u1ebfp v\u00e0 \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"wp-image-298331 size-full aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-2.jpg\" alt=\"Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng b\u1eb1ng nhau v\u00e0 vu\u00f4ng g\u00f3c\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng<\/h3>\n<ul>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau.<\/li>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/li>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c.<\/li>\n<li>H\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.<\/li>\n<li>H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/li>\n<\/ul>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft c\u1ea1nh<\/h2>\n<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng \u0111\u1ed9 d\u00e0i c\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3:<\/p>\n<p style=\"text-align: center;\"><strong>S = a \u00d7 a = a\u00b2<\/strong><\/p>\n<p>Trong \u0111\u00f3 S l\u00e0 di\u1ec7n t\u00edch, a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh. C\u00f3 th\u1ec3 hi\u1ec3u b\u1eb1ng c\u00e1ch \u0111\u1ebfm \u00f4: h\u00ecnh vu\u00f4ng c\u1ea1nh 3 \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c chia th\u00e0nh 3 h\u00e0ng, m\u1ed7i h\u00e0ng 3 \u00f4 vu\u00f4ng \u0111\u01a1n v\u1ecb, t\u1ed5ng c\u1ed9ng 9 \u00f4.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-298332 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-3.jpg\" alt=\"\u0110\u1ebfm \u00f4 vu\u00f4ng \u0111\u1ec3 hi\u1ec3u di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>V\u00ed d\u1ee5: h\u00ecnh vu\u00f4ng c\u1ea1nh 5 cm c\u00f3 di\u1ec7n t\u00edch S = 5 \u00d7 5 = 25 cm\u00b2; h\u00ecnh vu\u00f4ng c\u1ea1nh 7 m c\u00f3 di\u1ec7n t\u00edch 7 \u00d7 7 = 49 m\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-298333 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-4.jpg\" alt=\"C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng S = a x a\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft chu vi<\/h2>\n<p>Chu vi h\u00ecnh vu\u00f4ng l\u00e0 P = a \u00d7 4, n\u00ean mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch t\u1eeb chu vi ta l\u00e0m hai b\u01b0\u1edbc:<\/p>\n<ol>\n<li>T\u00ecm c\u1ea1nh: a = P : 4.<\/li>\n<li>T\u00ednh di\u1ec7n t\u00edch: S = a \u00d7 a.<\/li>\n<\/ol>\n<p>V\u00ed d\u1ee5: h\u00ecnh vu\u00f4ng c\u00f3 chu vi 20 cm th\u00ec c\u1ea1nh l\u00e0 20 : 4 = 5 cm, di\u1ec7n t\u00edch l\u00e0 5 \u00d7 5 = 25 cm\u00b2. C\u00e1ch t\u00ednh chu vi v\u00e0 \u0111\u01b0\u1eddng ch\u00e9o chi ti\u1ebft c\u00f3 trong b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cach-tinh-chu-vi-hinh-vuong\/\">c\u00e1ch t\u00ednh chu vi h\u00ecnh vu\u00f4ng<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-298334\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-5.jpg\" alt=\"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft chu vi\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o<\/h2>\n<p>H\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh thoi \u0111\u1eb7c bi\u1ec7t n\u00ean di\u1ec7n t\u00edch b\u1eb1ng n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o. V\u00ec hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau (c\u00f9ng b\u1eb1ng d):<\/p>\n<p style=\"text-align: center;\"><strong>S = d \u00d7 d : 2 = d\u00b2 \/ 2<\/strong><\/p>\n<p>V\u00ed d\u1ee5: h\u00ecnh vu\u00f4ng c\u00f3 \u0111\u01b0\u1eddng ch\u00e9o 10 cm th\u00ec S = 10 \u00d7 10 : 2 = 50 cm\u00b2. H\u00ecnh vu\u00f4ng c\u00f3 \u0111\u01b0\u1eddng ch\u00e9o 8 cm th\u00ec S = 64 : 2 = 32 cm\u00b2.<\/p>\n<p>L\u01b0u \u00fd: di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng <strong>kh\u00f4ng<\/strong> b\u1eb1ng t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o m\u00e0 b\u1eb1ng <strong>m\u1ed9t n\u1eeda<\/strong> t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-298335 size-full aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-6.jpg\" alt=\"\u0110\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-298337\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-8.jpg\" alt=\"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng qua hai \u0111\u01b0\u1eddng ch\u00e9o\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-8-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-8-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c c\u00e1ch suy lu\u1eadn kh\u00e1c<\/h2>\n<ul>\n<li><strong>Chia th\u00e0nh hai tam gi\u00e1c:<\/strong> m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau, di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch hai tam gi\u00e1c.<\/li>\n<li><strong>Chia th\u00e0nh hai h\u00ecnh ch\u1eef nh\u1eadt:<\/strong> k\u1ebb m\u1ed9t \u0111o\u1ea1n song song v\u1edbi m\u1ed9t c\u1ea1nh, di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch hai <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-chu-nhat\/\">h\u00ecnh ch\u1eef nh\u1eadt<\/a> t\u1ea1o th\u00e0nh.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-298336 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-7.jpg\" alt=\"Chia h\u00ecnh vu\u00f4ng th\u00e0nh hai h\u00ecnh ch\u1eef nh\u1eadt\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>M\u1eb9o nh\u1edb nhanh \u0111\u1ec3 kh\u00f4ng nh\u1ea7m v\u1edbi chu vi:<\/p>\n<p><em>&#8220;Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng,<br \/>C\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3, ta t\u00ecm ra.<br \/>Chu vi th\u00ec t\u00ednh kh\u00e1c xa,<br \/>C\u1ea1nh nh\u00e2n v\u1edbi b\u1ed1n, th\u1ebf l\u00e0 xong ngay.&#8221;<\/em><\/p>\n<h2>L\u01b0u \u00fd khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/h2>\n<ul>\n<li>\u0110\u1ed5i m\u1ecdi s\u1ed1 \u0111o v\u1ec1 c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i (mm, cm, dm, m) tr\u01b0\u1edbc khi t\u00ednh.<\/li>\n<li>K\u1ebft qu\u1ea3 di\u1ec7n t\u00edch ghi b\u1eb1ng \u0111\u01a1n v\u1ecb vu\u00f4ng (cm\u00b2, m\u00b2\u2026), kh\u00f4ng ghi cm hay m.<\/li>\n<li>Ph\u00e2n bi\u1ec7t r\u00f5 di\u1ec7n t\u00edch (a \u00d7 a) v\u00e0 chu vi (a \u00d7 4).<\/li>\n<li>N\u1ebfu \u0111\u1ec1 kh\u00f4ng cho c\u1ea1nh, h\u00e3y d\u00f9ng chu vi, \u0111\u01b0\u1eddng ch\u00e9o ho\u1eb7c t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt, h\u00ecnh thoi \u0111\u1ec3 suy ra.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-298338 size-full\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-9.jpg\" alt=\"C\u00e1c s\u1ed1 \u0111o ph\u1ea3i c\u00f9ng \u0111\u01a1n v\u1ecb khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-9.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-9-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-9-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p><strong>B\u00e0i 1 (\u0111\u1ed5i \u0111\u01a1n v\u1ecb):<\/strong> T\u1edd gi\u1ea5y h\u00ecnh vu\u00f4ng c\u1ea1nh 100 mm. T\u00ednh di\u1ec7n t\u00edch theo cm\u00b2.<br \/>L\u1eddi gi\u1ea3i: 100 mm = 10 cm. S = 10 \u00d7 10 = 100 cm\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-298340\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-11.jpg\" alt=\"B\u00e0i t\u1eadp di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u1ea1nh 100 mm\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-11.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-11-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-11-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>B\u00e0i 2 (bi\u1ebft chu vi):<\/strong> M\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng c\u00f3 chu vi 72 m. T\u00ednh di\u1ec7n t\u00edch.<br \/>L\u1eddi gi\u1ea3i: c\u1ea1nh a = 72 : 4 = 18 m. S = 18 \u00d7 18 = 324 m\u00b2.<\/p>\n<p><strong>B\u00e0i 3 (nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng):<\/strong> H\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng, c\u1ea1nh 8 cm. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh \u0111\u00f3.<br \/>L\u1eddi gi\u1ea3i: h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh vu\u00f4ng, n\u00ean S = 8 \u00d7 8 = 64 cm\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-298339\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-10.jpg\" alt=\"B\u00e0i t\u1eadp di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u1ea1nh 8 cm\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-10-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-10-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>B\u00e0i 4 (chu vi c\u00f3 hai \u0111\u01a1n v\u1ecb):<\/strong> H\u00ecnh vu\u00f4ng ABCD c\u00f3 chu vi 4 dm 4 cm. T\u00ednh di\u1ec7n t\u00edch theo cm\u00b2.<br \/>L\u1eddi gi\u1ea3i: 4 dm 4 cm = 44 cm. C\u1ea1nh a = 44 : 4 = 11 cm. S = 11 \u00d7 11 = 121 cm\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-298341\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-12.jpg\" alt=\"B\u00e0i t\u1eadp h\u00ecnh vu\u00f4ng c\u00f3 chu vi 4 dm 4 cm\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-12.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-12-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-12-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>B\u00e0i 5 (gh\u00e9p h\u00ecnh):<\/strong> Gh\u00e9p 9 m\u1ea3nh gi\u1ea5y h\u00ecnh vu\u00f4ng c\u1ea1nh 5 cm th\u00e0nh m\u1ed9t h\u00ecnh vu\u00f4ng l\u1edbn. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u1edbn.<br \/>L\u1eddi gi\u1ea3i: m\u1ed7i m\u1ea3nh c\u00f3 di\u1ec7n t\u00edch 5 \u00d7 5 = 25 cm\u00b2, h\u00ecnh l\u1edbn c\u00f3 di\u1ec7n t\u00edch 25 \u00d7 9 = 225 cm\u00b2 (h\u00ecnh l\u1edbn c\u00f3 c\u1ea1nh 15 cm, 15 \u00d7 15 = 225 cm\u00b2).<\/p>\n<p><strong>B\u00e0i 6 (th\u1ef1c t\u1ebf):<\/strong> M\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng th\u00eam 6 m v\u1ec1 m\u1ed9t ph\u00eda th\u00e0nh h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 112 m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t sau khi m\u1edf r\u1ed9ng.<br \/>L\u1eddi gi\u1ea3i: g\u1ecdi c\u1ea1nh h\u00ecnh vu\u00f4ng l\u00e0 a. Chu vi h\u00ecnh ch\u1eef nh\u1eadt: 2 \u00d7 (a + a + 6) = 112 \u21d2 2a + 6 = 56 \u21d2 a = 25 m. C\u00e1c c\u1ea1nh m\u1edbi l\u00e0 25 m v\u00e0 31 m, di\u1ec7n t\u00edch l\u00e0 25 \u00d7 31 = 775 m\u00b2.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng g\u00ec?<\/h3>\n<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng c\u1ea1nh nh\u00e2n c\u1ea1nh: S = a \u00d7 a = a\u00b2.<\/p>\n<h3>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u00f3 b\u1eb1ng t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o: S = d \u00d7 d : 2. V\u00ed d\u1ee5 \u0111\u01b0\u1eddng ch\u00e9o 10 cm th\u00ec di\u1ec7n t\u00edch l\u00e0 50 cm\u00b2.<\/p>\n<h3>Bi\u1ebft chu vi, t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?<\/h3>\n<p>L\u1ea5y chu vi chia 4 \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u1ea1nh, r\u1ed3i nh\u00e2n c\u1ea1nh v\u1edbi ch\u00ednh n\u00f3. V\u00ed d\u1ee5 chu vi 72 m th\u00ec c\u1ea1nh 18 m, di\u1ec7n t\u00edch 324 m\u00b2.<\/p>\n<h3>Bi\u1ebft di\u1ec7n t\u00edch, t\u00ednh c\u1ea1nh h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?<\/h3>\n<p>C\u1ea1nh b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a di\u1ec7n t\u00edch. V\u00ed d\u1ee5 di\u1ec7n t\u00edch 36 cm\u00b2 th\u00ec c\u1ea1nh l\u00e0 6 cm.<\/p>\n<h3>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng h\u1ecdc \u1edf l\u1edbp m\u1ea5y?<\/h3>\n<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c h\u1ecdc c\u00f9ng di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u1edf To\u00e1n l\u1edbp 3, sau \u0111\u00f3 d\u00f9ng l\u1ea1i trong c\u00e1c b\u00e0i to\u00e1n l\u1edbp 4, l\u1edbp 5 v\u00e0 h\u00ecnh h\u1ecdc l\u1edbp 8.<\/p>\n<h3>H\u00ecnh vu\u00f4ng c\u00f3 ph\u1ea3i h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng?<\/h3>\n<p>C\u00f3. H\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau, \u0111\u1ed3ng th\u1eddi c\u0169ng l\u00e0 h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng c\u1ea1nh nh\u00e2n c\u1ea1nh: S = a \u00d7 a = a\u00b2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u00f3 b\u1eb1ng t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Kh\u00f4ng. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch hai \u0111\u01b0\u1eddng ch\u00e9o: S = d \u00d7 d : 2. V\u00ed d\u1ee5 \u0111\u01b0\u1eddng ch\u00e9o 10 cm th\u00ec di\u1ec7n t\u00edch l\u00e0 50 cm\u00b2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Bi\u1ebft chu vi, t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y chu vi chia 4 \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u1ea1nh, r\u1ed3i nh\u00e2n c\u1ea1nh v\u1edbi ch\u00ednh n\u00f3. V\u00ed d\u1ee5 chu vi 72 m th\u00ec c\u1ea1nh 18 m, di\u1ec7n t\u00edch 324 m\u00b2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Bi\u1ebft di\u1ec7n t\u00edch, t\u00ednh c\u1ea1nh h\u00ecnh vu\u00f4ng th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u1ea1nh b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a di\u1ec7n t\u00edch. V\u00ed d\u1ee5 di\u1ec7n t\u00edch 36 cm\u00b2 th\u00ec c\u1ea1nh l\u00e0 6 cm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng h\u1ecdc \u1edf l\u1edbp m\u1ea5y?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c h\u1ecdc c\u00f9ng di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u1edf To\u00e1n l\u1edbp 3, sau \u0111\u00f3 d\u00f9ng l\u1ea1i trong c\u00e1c b\u00e0i to\u00e1n l\u1edbp 4, l\u1edbp 5 v\u00e0 h\u00ecnh h\u1ecdc l\u1edbp 8.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"H\u00ecnh vu\u00f4ng c\u00f3 ph\u1ea3i h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u00f3. H\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau, \u0111\u1ed3ng th\u1eddi c\u0169ng l\u00e0 h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u1ea1nh nh\u00e2n c\u1ea1nh, S = a\u00b2; khi ch\u1ec9 bi\u1ebft chu vi th\u00ec chia 4 \u0111\u1ec3 t\u00ecm c\u1ea1nh, khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o th\u00ec l\u1ea5y d\u00b2 chia 2. Nh\u1edb \u0111\u1ed5i v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb v\u00e0 ghi k\u1ebft qu\u1ea3 b\u1eb1ng \u0111\u01a1n v\u1ecb vu\u00f4ng l\u00e0 tr\u00e1nh \u0111\u01b0\u1ee3c h\u1ea7u h\u1ebft l\u1ed7i sai. B\u1ea1n c\u00f3 th\u1ec3 h\u1ecdc ti\u1ebfp b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-chu-nhat\/\">di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/a> v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-tron\/\">di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3: S = a \u00d7 a = a\u00b2. V\u00ed d\u1ee5 h\u00ecnh vu\u00f4ng c\u1ea1nh 5 cm c\u00f3 di\u1ec7n t\u00edch S = 5 \u00d7 5 = 25 cm\u00b2. N\u1ebfu ch\u1ec9 bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o d th\u00ec S = d\u00b2 : 2; n\u1ebfu bi\u1ebft chu vi P [&hellip;]<\/p>\n","protected":false},"author":97,"featured_media":298329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng","_yoast_wpseo_title":"C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Vu\u00f4ng - C\u00f4ng Th\u1ee9c, V\u00ed D\u1ee5 & 5+ B\u00e0i T\u1eadp C\u00f3 L\u1eddi Gi\u1ea3i","_yoast_wpseo_metadesc":"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. Bao g\u1ed3m c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u00ednh t\u1eeb chu vi, \u0111\u01b0\u1eddng ch\u00e9o, v\u00ed d\u1ee5 minh h\u1ecda v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-298328","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>C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Vu\u00f4ng - C\u00f4ng Th\u1ee9c, V\u00ed D\u1ee5 &amp; 5+ B\u00e0i T\u1eadp C\u00f3 L\u1eddi Gi\u1ea3i<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. 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