{"id":296659,"date":"2023-12-15T20:39:57","date_gmt":"2023-12-15T13:39:57","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=296659"},"modified":"2026-11-05T14:00:04","modified_gmt":"2026-11-05T07:00:04","slug":"dien-tich-hinh-chu-nhat","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-chu-nhat\/","title":{"rendered":"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4: C\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i"},"content":{"rendered":"<p><strong>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng (c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o): S = a \u00d7 b.<\/strong> V\u00ed d\u1ee5 h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 5 cm, r\u1ed9ng 3 cm c\u00f3 di\u1ec7n t\u00edch S = 5 \u00d7 3 = 15 cm\u00b2. C\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c h\u1ecdc t\u1eeb To\u00e1n l\u1edbp 3 v\u00e0 d\u00f9ng xuy\u00ean su\u1ed1t l\u1edbp 4, l\u1edbp 5. B\u00e0i vi\u1ebft tr\u00ecnh b\u00e0y c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ecm chi\u1ec1u d\u00e0i ho\u1eb7c chi\u1ec1u r\u1ed9ng khi bi\u1ebft di\u1ec7n t\u00edch, c\u00e1c d\u1ea1ng to\u00e1n th\u01b0\u1eddng g\u1eb7p v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ec3 h\u1ecdc sinh t\u1ef1 luy\u1ec7n, ph\u1ee5 huynh d\u1ec5 k\u00e8m con h\u1ecdc.<\/p>\n<p><strong>T\u00f3m t\u1eaft nhanh:<\/strong><\/p>\n<ul>\n<li><strong>C\u00f4ng th\u1ee9c:<\/strong> S = a \u00d7 b, v\u1edbi a l\u00e0 chi\u1ec1u d\u00e0i, b l\u00e0 chi\u1ec1u r\u1ed9ng.<\/li>\n<li><strong>T\u00ecm m\u1ed9t c\u1ea1nh:<\/strong> chi\u1ec1u d\u00e0i = S : chi\u1ec1u r\u1ed9ng; chi\u1ec1u r\u1ed9ng = S : chi\u1ec1u d\u00e0i.<\/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, c\u1ea1nh \u0111o b\u1eb1ng m th\u00ec di\u1ec7n t\u00edch l\u00e0 m\u00b2.<\/li>\n<li><strong>L\u1ed7i hay g\u1eb7p:<\/strong> qu\u00ean \u0111\u1ed5i hai c\u1ea1nh v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi nh\u00e2n.<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-296667 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat.jpg\" alt=\"H\u00ecnh ch\u1eef nh\u1eadt ABCD v\u1edbi chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 g\u00ec?<\/h2>\n<p>H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng. T\u1eeb \u0111\u1ecbnh ngh\u0129a n\u00e0y suy ra c\u00e1c t\u00ednh ch\u1ea5t quen thu\u1ed9c:<\/p>\n<ul>\n<li>Hai c\u1ea1nh \u0111\u1ed1i di\u1ec7n song song v\u00e0 b\u1eb1ng nhau: hai c\u1ea1nh d\u00e0i g\u1ecdi l\u00e0 chi\u1ec1u d\u00e0i, hai c\u1ea1nh ng\u1eafn g\u1ecdi l\u00e0 chi\u1ec1u r\u1ed9ng.<\/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 v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng; m\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh ch\u1eef nh\u1eadt th\u00e0nh hai tam gi\u00e1c vu\u00f4ng b\u1eb1ng nhau.<\/li>\n<\/ul>\n<p>H\u00ecnh vu\u00f4ng l\u00e0 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt khi chi\u1ec1u d\u00e0i b\u1eb1ng chi\u1ec1u r\u1ed9ng.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-296662 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4.jpg\" alt=\"T\u00ednh ch\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt: c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau, b\u1ed1n g\u00f3c vu\u00f4ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt, ta l\u1ea5y chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng (c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o):<\/p>\n<p style=\"text-align: center;\"><strong>S = a \u00d7 b<\/strong><\/p>\n<p>Trong \u0111\u00f3 S l\u00e0 di\u1ec7n t\u00edch, a l\u00e0 chi\u1ec1u d\u00e0i, b l\u00e0 chi\u1ec1u r\u1ed9ng. C\u00e1ch hi\u1ec3u \u0111\u01a1n gi\u1ea3n cho h\u1ecdc sinh ti\u1ec3u h\u1ecdc: n\u1ebfu chia h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 5 cm, r\u1ed9ng 3 cm th\u00e0nh c\u00e1c \u00f4 vu\u00f4ng c\u1ea1nh 1 cm, ta \u0111\u01b0\u1ee3c 3 h\u00e0ng, m\u1ed7i h\u00e0ng 5 \u00f4, t\u1ed5ng c\u1ed9ng 15 \u00f4 vu\u00f4ng 1 cm\u00b2, n\u00ean di\u1ec7n t\u00edch l\u00e0 15 cm\u00b2.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-296665 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1.jpg\" alt=\"C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt S = a x b\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>C\u1ea7n t\u00ecm<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<th>V\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Di\u1ec7n t\u00edch<\/td>\n<td>S = a \u00d7 b<\/td>\n<td>a = 10 cm, b = 7 cm \u2192 S = 70 cm\u00b2<\/td>\n<\/tr>\n<tr>\n<td>Chi\u1ec1u d\u00e0i<\/td>\n<td>a = S : b<\/td>\n<td>S = 50 m\u00b2, b = 5 m \u2192 a = 10 m<\/td>\n<\/tr>\n<tr>\n<td>Chi\u1ec1u r\u1ed9ng<\/td>\n<td>b = S : a<\/td>\n<td>S = 120 cm\u00b2, a = 15 cm \u2192 b = 8 cm<\/td>\n<\/tr>\n<tr>\n<td>Chu vi (\u0111\u1ec3 \u0111\u1ed1i chi\u1ebfu)<\/td>\n<td>P = (a + b) \u00d7 2<\/td>\n<td>a = 12 cm, b = 5 cm \u2192 P = 34 cm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0110\u1eebng nh\u1ea7m di\u1ec7n t\u00edch v\u1edbi chu vi: chu vi l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao quanh h\u00ecnh, \u0111\u01a1n v\u1ecb l\u00e0 cm, m; xem th\u00eam b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-chu-nhat\/\">chu vi h\u00ecnh ch\u1eef nh\u1eadt<\/a>.<\/p>\n<h2>V\u00ed d\u1ee5 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p><strong>V\u00ed d\u1ee5 1:<\/strong> T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 5 cm, chi\u1ec1u r\u1ed9ng 3 cm.<br \/>L\u1eddi gi\u1ea3i: S = 5 \u00d7 3 = 15 (cm\u00b2).<\/p>\n<p><strong>V\u00ed d\u1ee5 2:<\/strong> M\u1ed9t khu v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 15 m, r\u1ed9ng 10 m. T\u00ednh di\u1ec7n t\u00edch khu v\u01b0\u1eddn.<br \/>L\u1eddi gi\u1ea3i: S = 15 \u00d7 10 = 150 (m\u00b2).<\/p>\n<p><strong>V\u00ed d\u1ee5 3:<\/strong> M\u1ed9t ph\u00f2ng h\u1ecdc h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 8 m, r\u1ed9ng 6 m. T\u00ednh di\u1ec7n t\u00edch ph\u00f2ng h\u1ecdc.<br \/>L\u1eddi gi\u1ea3i: S = 8 \u00d7 6 = 48 (m\u00b2).<\/p>\n<p><strong>V\u00ed d\u1ee5 4 (kh\u00e1c \u0111\u01a1n v\u1ecb):<\/strong> T\u1ea5m b\u1ea3ng d\u00e0i 5 m, r\u1ed9ng 80 cm. T\u00ednh di\u1ec7n t\u00edch t\u1ea5m b\u1ea3ng.<br \/>L\u1eddi gi\u1ea3i: \u0111\u1ed5i 5 m = 500 cm. S = 500 \u00d7 80 = 40 000 (cm\u00b2) = 4 m\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296663 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3.jpg\" alt=\"V\u00ed d\u1ee5 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c d\u1ea1ng to\u00e1n th\u01b0\u1eddng g\u1eb7p v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<h3>D\u1ea1ng 1: Bi\u1ebft chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng, t\u00ednh di\u1ec7n t\u00edch<\/h3>\n<p>\u00c1p d\u1ee5ng tr\u1ef1c ti\u1ebfp S = a \u00d7 b, nh\u1edb ki\u1ec3m tra \u0111\u01a1n v\u1ecb. V\u00ed d\u1ee5: h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 10 cm, r\u1ed9ng 7 cm c\u00f3 S = 10 \u00d7 7 = 70 cm\u00b2.<\/p>\n<h3>D\u1ea1ng 2: Bi\u1ebft di\u1ec7n t\u00edch v\u00e0 m\u1ed9t c\u1ea1nh, t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i<\/h3>\n<p>L\u1ea5y di\u1ec7n t\u00edch chia cho c\u1ea1nh \u0111\u00e3 bi\u1ebft. V\u00ed d\u1ee5: m\u1ea3nh v\u01b0\u1eddn di\u1ec7n t\u00edch 50 m\u00b2, chi\u1ec1u r\u1ed9ng 5 m th\u00ec chi\u1ec1u d\u00e0i l\u00e0 50 : 5 = 10 m.<\/p>\n<h3>D\u1ea1ng 3: Bi\u1ebft chu vi v\u00e0 m\u1ed9t c\u1ea1nh, t\u00ednh di\u1ec7n t\u00edch<\/h3>\n<p>T\u00ecm n\u1eeda chu vi, suy ra c\u1ea1nh c\u00f2n l\u1ea1i r\u1ed3i nh\u00e2n. V\u00ed d\u1ee5: h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 20 cm, chi\u1ec1u r\u1ed9ng 4 cm. N\u1eeda chu vi l\u00e0 20 : 2 = 10 cm, chi\u1ec1u d\u00e0i l\u00e0 10 \u2212 4 = 6 cm, di\u1ec7n t\u00edch l\u00e0 6 \u00d7 4 = 24 cm\u00b2.<\/p>\n<h3>D\u1ea1ng 4: Bi\u1ebft t\u1ed5ng (ho\u1eb7c quan h\u1ec7 g\u1ea5p l\u1ea7n) c\u1ee7a hai c\u1ea1nh<\/h3>\n<p>D\u00f9ng b\u00e0i to\u00e1n t\u1ed5ng \u2013 t\u1ec9 \u0111\u1ec3 t\u00ecm t\u1eebng c\u1ea1nh. V\u00ed d\u1ee5: chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ed9ng l\u1ea1i l\u00e0 27 m, chi\u1ec1u d\u00e0i g\u1ea5p \u0111\u00f4i chi\u1ec1u r\u1ed9ng. T\u1ed5ng s\u1ed1 ph\u1ea7n b\u1eb1ng nhau l\u00e0 1 + 2 = 3, chi\u1ec1u r\u1ed9ng l\u00e0 27 : 3 = 9 m, chi\u1ec1u d\u00e0i l\u00e0 9 \u00d7 2 = 18 m, di\u1ec7n t\u00edch l\u00e0 18 \u00d7 9 = 162 m\u00b2.<\/p>\n<h3>D\u1ea1ng 5: Bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o v\u00e0 m\u1ed9t c\u1ea1nh (l\u1edbp 7 tr\u1edf l\u00ean)<\/h3>\n<p>D\u00f9ng <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dinh-ly-pytago\/\">\u0111\u1ecbnh l\u00fd Pytago<\/a> \u0111\u1ec3 t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i. V\u00ed d\u1ee5: chi\u1ec1u r\u1ed9ng 5 cm, \u0111\u01b0\u1eddng ch\u00e9o 13 cm th\u00ec chi\u1ec1u d\u00e0i l\u00e0 \u221a(13\u00b2 \u2212 5\u00b2) = \u221a144 = 12 cm, di\u1ec7n t\u00edch l\u00e0 12 \u00d7 5 = 60 cm\u00b2.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296664 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2.jpg\" alt=\"H\u00ecnh ch\u1eef nh\u1eadt v\u00e0 hai \u0111\u01b0\u1eddng ch\u00e9o\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n c\u00f3 \u0111\u00e1p \u00e1n<\/h2>\n<ol>\n<li>T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 15 cm, r\u1ed9ng 6 cm. <em>\u0110\u00e1p \u00e1n: 90 cm\u00b2.<\/em><\/li>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 di\u1ec7n t\u00edch 120 cm\u00b2, chi\u1ec1u d\u00e0i 15 cm. T\u00ecm chi\u1ec1u r\u1ed9ng. <em>\u0110\u00e1p \u00e1n: 120 : 15 = 8 cm.<\/em><\/li>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng 8 cm, di\u1ec7n t\u00edch 96 cm\u00b2. T\u00ecm chi\u1ec1u d\u00e0i. <em>\u0110\u00e1p \u00e1n: 96 : 8 = 12 cm.<\/em><\/li>\n<li>H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng 4 m, chi\u1ec1u d\u00e0i g\u1ea5p 3 l\u1ea7n chi\u1ec1u r\u1ed9ng. T\u00ednh di\u1ec7n t\u00edch. <em>\u0110\u00e1p \u00e1n: chi\u1ec1u d\u00e0i 12 m, di\u1ec7n t\u00edch 48 m\u00b2.<\/em><\/li>\n<li>M\u1ea3nh \u0111\u1ea5t x\u00e2y nh\u00e0 d\u00e0i 20 m, r\u1ed9ng 15 m. T\u00ednh di\u1ec7n t\u00edch. <em>\u0110\u00e1p \u00e1n: 300 m\u00b2.<\/em><\/li>\n<li>Chu vi h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 36 m, chi\u1ec1u d\u00e0i g\u1ea5p \u0111\u00f4i chi\u1ec1u r\u1ed9ng. T\u00ednh di\u1ec7n t\u00edch. <em>\u0110\u00e1p \u00e1n: n\u1eeda chu vi 18 m chia 3 ph\u1ea7n, chi\u1ec1u r\u1ed9ng 6 m, chi\u1ec1u d\u00e0i 12 m, di\u1ec7n t\u00edch 72 m\u00b2.<\/em><\/li>\n<li>M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c gh\u00e9p t\u1eeb 4 h\u00ecnh vu\u00f4ng c\u1ea1nh 3 cm. T\u00ednh di\u1ec7n t\u00edch. <em>\u0110\u00e1p \u00e1n: 4 \u00d7 (3 \u00d7 3) = 36 cm\u00b2.<\/em><\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296660 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6.jpg\" alt=\"Gh\u00e9p nhi\u1ec1u h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>L\u1ed7i th\u01b0\u1eddng g\u1eb7p khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<ul>\n<li><strong>Kh\u00f4ng \u0111\u1ed5i \u0111\u01a1n v\u1ecb:<\/strong> nh\u00e2n 5 m v\u1edbi 80 cm ra 400 l\u00e0 sai; ph\u1ea3i \u0111\u1ed5i c\u00f9ng \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc.<\/li>\n<li><strong>Nh\u1ea7m v\u1edbi chu vi:<\/strong> di\u1ec7n t\u00edch l\u00e0 ph\u00e9p nh\u00e2n, chu vi l\u00e0 (d\u00e0i + r\u1ed9ng) \u00d7 2.<\/li>\n<li><strong>Ghi sai \u0111\u01a1n v\u1ecb k\u1ebft qu\u1ea3:<\/strong> di\u1ec7n t\u00edch ph\u1ea3i ghi \u0111\u01a1n v\u1ecb vu\u00f4ng (cm\u00b2, m\u00b2), kh\u00f4ng ghi cm hay m.<\/li>\n<li><strong>\u0110\u1ecdc thi\u1ebfu d\u1eef ki\u1ec7n:<\/strong> v\u1edbi b\u00e0i cho chu vi ho\u1eb7c t\u1ed5ng hai c\u1ea1nh, ph\u1ea3i t\u00ecm \u0111\u1ee7 hai c\u1ea1nh r\u1ed3i m\u1edbi t\u00ednh di\u1ec7n t\u00edch.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296661 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5.jpg\" alt=\"L\u01b0u \u00fd khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Khi c\u1ea7n ki\u1ec3m tra l\u1ea1i ph\u00e9p t\u00ednh, h\u1ecdc sinh c\u00f3 th\u1ec3 d\u00f9ng m\u00e1y t\u00ednh c\u1ea7m tay, xem b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/may-tinh-580\/\">m\u00e1y t\u00ednh Casio fx-580VN X<\/a>.<\/p>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt trong th\u1ef1c t\u1ebf<\/h2>\n<p>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt d\u00f9ng h\u1eb1ng ng\u00e0y: t\u00ednh s\u1ed1 m\u00e9t vu\u00f4ng s\u00e0n \u0111\u1ec3 l\u00e1t g\u1ea1ch, di\u1ec7n t\u00edch t\u01b0\u1eddng c\u1ea7n s\u01a1n, di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t, t\u1ea5m v\u1ea3i hay t\u1ea5m k\u00ednh. V\u00ed d\u1ee5 ph\u00f2ng d\u00e0i 8 m, r\u1ed9ng 6 m c\u1ea7n kho\u1ea3ng 48 m\u00b2 g\u1ea1ch l\u00e1t n\u1ec1n (ch\u01b0a t\u00ednh hao h\u1ee5t). T\u1eeb h\u00ecnh ch\u1eef nh\u1eadt, h\u1ecdc sinh s\u1ebd h\u1ecdc ti\u1ebfp <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\">di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/a> v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-hop-chu-nhat\/\">di\u1ec7n t\u00edch h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt<\/a>.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng g\u00ec?<\/h3>\n<p>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng, c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o: S = a \u00d7 b.<\/p>\n<h3>Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ta l\u00e0m th\u1ebf n\u00e0o?<\/h3>\n<p>\u0110\u1ed5i chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb, r\u1ed3i l\u1ea5y chi\u1ec1u d\u00e0i nh\u00e2n chi\u1ec1u r\u1ed9ng; k\u1ebft qu\u1ea3 ghi \u0111\u01a1n v\u1ecb vu\u00f4ng nh\u01b0 cm\u00b2 ho\u1eb7c m\u00b2.<\/p>\n<h3>Bi\u1ebft di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u r\u1ed9ng, t\u00ednh chi\u1ec1u d\u00e0i th\u1ebf n\u00e0o?<\/h3>\n<p>L\u1ea5y di\u1ec7n t\u00edch chia cho chi\u1ec1u r\u1ed9ng. V\u00ed d\u1ee5 di\u1ec7n t\u00edch 96 cm\u00b2, chi\u1ec1u r\u1ed9ng 8 cm th\u00ec chi\u1ec1u d\u00e0i l\u00e0 12 cm.<\/p>\n<h3>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt h\u1ecdc \u1edf l\u1edbp m\u1ea5y?<\/h3>\n<p>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c h\u1ecdc t\u1eeb To\u00e1n l\u1edbp 3 v\u00e0 ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng trong c\u00e1c b\u00e0i to\u00e1n l\u1edbp 4, l\u1edbp 5.<\/p>\n<h3>Di\u1ec7n t\u00edch v\u00e0 chu vi h\u00ecnh ch\u1eef nh\u1eadt kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3>\n<p>Di\u1ec7n t\u00edch l\u00e0 ph\u1ea7n m\u1eb7t ph\u1eb3ng b\u00ean trong h\u00ecnh, S = a \u00d7 b, \u0111\u01a1n v\u1ecb cm\u00b2 ho\u1eb7c m\u00b2. Chu vi l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao, P = (a + b) \u00d7 2, \u0111\u01a1n v\u1ecb cm ho\u1eb7c m.<\/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 chi\u1ec1u d\u00e0i b\u1eb1ng chi\u1ec1u r\u1ed9ng, n\u00ean di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng c\u1ea1nh nh\u00e2n c\u1ea1nh.<\/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 ch\u1eef nh\u1eadt b\u1eb1ng g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng, c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o: S = a \u00d7 b.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ta l\u00e0m th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u0110\u1ed5i chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng v\u1ec1 c\u00f9ng \u0111\u01a1n v\u1ecb, r\u1ed3i l\u1ea5y chi\u1ec1u d\u00e0i nh\u00e2n chi\u1ec1u r\u1ed9ng; k\u1ebft qu\u1ea3 ghi \u0111\u01a1n v\u1ecb vu\u00f4ng nh\u01b0 cm\u00b2 ho\u1eb7c m\u00b2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Bi\u1ebft di\u1ec7n t\u00edch v\u00e0 chi\u1ec1u r\u1ed9ng, t\u00ednh chi\u1ec1u d\u00e0i th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y di\u1ec7n t\u00edch chia cho chi\u1ec1u r\u1ed9ng. V\u00ed d\u1ee5 di\u1ec7n t\u00edch 96 cm\u00b2, chi\u1ec1u r\u1ed9ng 8 cm th\u00ec chi\u1ec1u d\u00e0i l\u00e0 12 cm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt h\u1ecdc \u1edf l\u1edbp m\u1ea5y?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c h\u1ecdc t\u1eeb To\u00e1n l\u1edbp 3 v\u00e0 ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng trong c\u00e1c b\u00e0i to\u00e1n l\u1edbp 4, l\u1edbp 5.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch v\u00e0 chu vi h\u00ecnh ch\u1eef nh\u1eadt kh\u00e1c nhau th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch l\u00e0 ph\u1ea7n m\u1eb7t ph\u1eb3ng b\u00ean trong h\u00ecnh, S = a \u00d7 b, \u0111\u01a1n v\u1ecb cm\u00b2 ho\u1eb7c m\u00b2. Chu vi l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao, P = (a + b) \u00d7 2, \u0111\u01a1n v\u1ecb cm ho\u1eb7c m.\"\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 chi\u1ec1u d\u00e0i b\u1eb1ng chi\u1ec1u r\u1ed9ng, n\u00ean di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng c\u1ea1nh nh\u00e2n c\u1ea1nh.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng chi\u1ec1u d\u00e0i nh\u00e2n chi\u1ec1u r\u1ed9ng, S = a \u00d7 b, v\u1edbi \u0111i\u1ec1u ki\u1ec7n hai c\u1ea1nh c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o. N\u1eafm ch\u1eafc c\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch suy ng\u01b0\u1ee3c ra m\u1ed9t c\u1ea1nh l\u00e0 \u0111\u1ee7 \u0111\u1ec3 gi\u1ea3i c\u00e1c d\u1ea1ng b\u00e0i t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn b\u00e0i c\u00f3 chu vi ho\u1eb7c t\u1ed5ng \u2013 t\u1ec9. B\u1ea1n c\u00f3 th\u1ec3 h\u1ecdc ti\u1ebfp c\u00e1c b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-tron\/\">chu vi h\u00ecnh tr\u00f2n<\/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 ch\u1eef nh\u1eadt b\u1eb1ng chi\u1ec1u d\u00e0i nh\u00e2n v\u1edbi chi\u1ec1u r\u1ed9ng (c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o): S = a \u00d7 b. V\u00ed d\u1ee5 h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 5 cm, r\u1ed9ng 3 cm c\u00f3 di\u1ec7n t\u00edch S = 5 \u00d7 3 = 15 cm\u00b2. C\u00f4ng th\u1ee9c \u0111\u01b0\u1ee3c h\u1ecdc t\u1eeb To\u00e1n l\u1edbp 3 v\u00e0 d\u00f9ng xuy\u00ean [&hellip;]<\/p>\n","protected":false},"author":83,"featured_media":296666,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt","_yoast_wpseo_title":"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4: C\u00f4ng th\u1ee9c, b\u00e0i t\u1eadp chi ti\u1ebft c\u00f3 l\u1eddi gi\u1ea3i","_yoast_wpseo_metadesc":"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 \u0111\u01a1n gi\u1ea3n v\u1edbi c\u00f4ng th\u1ee9c S = a x b. H\u01b0\u1edbng d\u1eabn chi ti\u1ebft l\u00fd thuy\u1ebft, v\u00ed d\u1ee5, b\u00e0i t\u1eadp SGK c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ea7y \u0111\u1ee7 gi\u00fap b\u00e9 l\u1edbp 4 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c. H\u1ecdc ngay!","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-296659","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>T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4: C\u00f4ng th\u1ee9c, b\u00e0i t\u1eadp chi ti\u1ebft c\u00f3 l\u1eddi gi\u1ea3i<\/title>\n<meta name=\"description\" content=\"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 \u0111\u01a1n gi\u1ea3n v\u1edbi c\u00f4ng th\u1ee9c S = a x b. H\u01b0\u1edbng d\u1eabn chi ti\u1ebft l\u00fd thuy\u1ebft, v\u00ed d\u1ee5, b\u00e0i t\u1eadp SGK c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ea7y \u0111\u1ee7 gi\u00fap b\u00e9 l\u1edbp 4 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c. H\u1ecdc ngay!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-chu-nhat\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4: C\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i\" \/>\n<meta property=\"og:description\" content=\"T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 \u0111\u01a1n gi\u1ea3n v\u1edbi c\u00f4ng th\u1ee9c S = a x b. H\u01b0\u1edbng d\u1eabn chi ti\u1ebft l\u00fd thuy\u1ebft, v\u00ed d\u1ee5, b\u00e0i t\u1eadp SGK c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ea7y \u0111\u1ee7 gi\u00fap b\u00e9 l\u1edbp 4 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c. 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