{"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":"2025-12-31T20:49:40","modified_gmt":"2025-12-31T13:49:40","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><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 l\u00e0 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n l\u1edbp 4, gi\u00fap b\u00e9 l\u00e0m quen v\u1edbi ph\u00e9p nh\u00e2n v\u00e0 \u0111o l\u01b0\u1eddng. C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 \u0111\u01a1n gi\u1ea3n: S = d\u00e0i x r\u1ed9ng. B\u00e0i vi\u1ebft h\u01b0\u1edbng d\u1eabn chi ti\u1ebft l\u00fd thuy\u1ebft SGK, v\u00ed d\u1ee5 minh h\u1ecda, b\u00e0i t\u1eadp l\u1edbp 4 c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ec3 b\u00e9 d\u1ec5 h\u1ecdc v\u00e0 ph\u1ee5 huynh d\u1ec5 k\u00e8m c\u1eb7p.<\/span><\/p>\n<h2>L\u00fd thuy\u1ebft c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt, ch\u00fang ta s\u1ebd c\u00f9ng t\u00ecm hi\u1ec3u s\u01a1 l\u01b0\u1ee3c v\u1ec1 h\u00ecnh n\u00e0y nh\u00e9. V\u1ec1 c\u01a1 b\u1ea3n, h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 m\u1ed9t h\u00ecnh h\u1ecdc quen thu\u1ed9c, g\u1eb7p r\u1ea5t nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng v\u00e0 h\u1ecdc t\u1eadp. Theo \u0111\u00f3, h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 h\u00ecnh c\u00f3 b\u1ed1n c\u1ea1nh, v\u1edbi hai c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau v\u00e0 song song. \u0110i\u1ec1u n\u00e0y t\u1ea1o n\u00ean m\u1ed9t h\u00ecnh d\u1ea1ng \u0111\u1eb7c tr\u01b0ng, d\u1ec5 nh\u1eadn bi\u1ebft v\u00e0 \u00e1p d\u1ee5ng.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-296667 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat.jpg\" alt=\"dien-tich-hinh-chu-nhat\" 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\"><\/picture><\/p>\n<p>M\u1ed9t trong nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 c\u00e1c g\u00f3c c\u1ee7a n\u00f3. M\u1ed7i g\u00f3c trong h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 m\u1ed9t g\u00f3c vu\u00f4ng, t\u1ee9c l\u00e0 90 \u0111\u1ed9. Qua \u0111\u00f3 kh\u00f4ng ch\u1ec9 l\u00e0m cho h\u00ecnh ch\u1eef nh\u1eadt tr\u1edf n\u00ean \u0111\u1eb7c bi\u1ec7t trong th\u1ebf gi\u1edbi h\u00ecnh h\u1ecdc m\u00e0 c\u00f2n gi\u00fap ch\u00fang ta d\u1ec5 d\u00e0ng h\u00ecnh dung v\u00e0 t\u00ednh to\u00e1n c\u00e1c thu\u1ed9c t\u00ednh kh\u00e1c. B\u00ean c\u1ea1nh \u0111\u00f3, \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt c\u0169ng l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 th\u00fa v\u1ecb. Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau, \u0111\u1ed3ng th\u1eddi chia h\u00ecnh ch\u1eef nh\u1eadt th\u00e0nh hai tam gi\u00e1c \u0111\u1ec1u nhau.<\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ch\u00ednh x\u00e1c nh\u1ea5t<\/h2>\n<p>Trong h\u00ecnh h\u1ecdc, vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng c\u01a1 b\u1ea3n nh\u01b0ng c\u1ef1c k\u1ef3 quan tr\u1ecdng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00f4ng th\u1ee9c v\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 minh h\u1ecda khi t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1ea5t.<\/p>\n<h3><b>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Theo SGK To\u00e1n l\u1edbp 4, c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u00e0:<\/span><\/p>\n<p><b>S = a \u00d7 b<\/b><span style=\"font-weight: 400;\"> (trong \u0111\u00f3 a l\u00e0 chi\u1ec1u d\u00e0i, b l\u00e0 chi\u1ec1u r\u1ed9ng)<\/span><\/p>\n<p><b>V\u00ed d\u1ee5 1 (l\u1edbp 4):<\/b><span style=\"font-weight: 400;\"> 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.<\/span><\/p>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><span style=\"font-weight: 400;\"> S = 5 \u00d7 3 = 15 cm\u00b2.<\/span><\/p>\n<p><b>H\u00ecnh minh h\u1ecda:<\/b><span style=\"font-weight: 400;\"> [Th\u00eam h\u00ecnh v\u1ebd h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi l\u01b0\u1edbi \u00f4 vu\u00f4ng 5&#215;3]<\/span><\/p>\n<p><b>V\u00ed d\u1ee5 2:<\/b><span style=\"font-weight: 400;\"> 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.<\/span><\/p>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><span style=\"font-weight: 400;\"> S = 15 \u00d7 10 = 150 m\u00b2.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-296665 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-1.jpg\" alt=\"dien-tich-hinh-chu-nhat-1\" 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\"><\/picture><\/p>\n<h3>C\u00e1c b\u00e0i to\u00e1n minh h\u1ecda v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h3>\n<p><strong>B\u00e0i t\u1eadp 1<\/strong>: M\u1ed9t khu v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 15 m\u00e9t v\u00e0 chi\u1ec1u r\u1ed9ng 10 m\u00e9t. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a khu v\u01b0\u1eddn \u0111\u00f3.<\/p>\n<p>\u0110\u00e1p \u00e1n: Di\u1ec7n t\u00edch = 15 m\u00e9t x 10 m\u00e9t = 150 m\u00e9t vu\u00f4ng.<\/p>\n<p>L\u1eddi gi\u1ea3i: Di\u1ec7n t\u00edch c\u1ee7a khu v\u01b0\u1eddn \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch nh\u00e2n chi\u1ec1u d\u00e0i v\u1edbi chi\u1ec1u r\u1ed9ng. V\u00ec v\u1eady, di\u1ec7n t\u00edch c\u1ee7a khu v\u01b0\u1eddn l\u00e0 150 m\u00e9t vu\u00f4ng.<\/p>\n<p><strong>B\u00e0i t\u1eadp 2<\/strong>: M\u1ed9t ph\u00f2ng h\u1ecdc h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 8 m\u00e9t v\u00e0 chi\u1ec1u r\u1ed9ng 6 m\u00e9t. H\u00e3y t\u00ednh di\u1ec7n t\u00edch c\u1ee7a ph\u00f2ng h\u1ecdc \u0111\u00f3.<\/p>\n<p>\u0110\u00e1p \u00e1n: Di\u1ec7n t\u00edch = 8 m\u00e9t x 6 m\u00e9t = 48 m\u00e9t vu\u00f4ng.<\/p>\n<p>L\u1eddi gi\u1ea3i: S\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch, ta nh\u00e2n chi\u1ec1u d\u00e0i c\u1ee7a ph\u00f2ng h\u1ecdc v\u1edbi chi\u1ec1u r\u1ed9ng. Do \u0111\u00f3, di\u1ec7n t\u00edch c\u1ee7a ph\u00f2ng h\u1ecdc l\u00e0 48 m\u00e9t vu\u00f4ng.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-296664 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-2.jpg\" alt=\"dien-tich-hinh-chu-nhat-2\" 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\"><\/picture><\/p>\n<h2>Nh\u1eefng d\u1ea1ng to\u00e1n th\u01b0\u1eddng g\u1eb7p v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>Trong to\u00e1n h\u1ecdc, vi\u1ec7c h\u1ecdc c\u00e1ch t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng ch\u1ec9 h\u1eefu \u00edch m\u00e0 c\u00f2n th\u00fa v\u1ecb, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi h\u1ecdc sinh ti\u1ec3u h\u1ecdc. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 hai d\u1ea1ng b\u00e0i t\u1eadp c\u01a1 b\u1ea3n m\u00e0 c\u00e1c b\u1ea1n th\u01b0\u1eddng g\u1eb7p:<\/p>\n<p><strong>T\u00ednh di\u1ec7n t\u00edch khi bi\u1ebft chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng:<\/strong><\/p>\n<p>\u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i c\u01a1 b\u1ea3n nh\u1ea5t. H\u1ecdc sinh s\u1ebd \u0111\u01b0\u1ee3c cung c\u1ea5p th\u00f4ng tin v\u1ec1 chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 c\u1ea7n t\u00ednh di\u1ec7n t\u00edch c\u1ee7a n\u00f3. C\u00f4ng th\u1ee9c \u00e1p d\u1ee5ng r\u1ea5t \u0111\u01a1n gi\u1ea3n: S = Chi\u1ec1u d\u00e0i x Chi\u1ec1u r\u1ed9ng.<\/p>\n<p>V\u00ed d\u1ee5: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 10cm v\u00e0 chi\u1ec1u r\u1ed9ng 7cm. Di\u1ec7n t\u00edch c\u1ee7a n\u00f3 l\u00e0 bao nhi\u00eau?<\/p>\n<p>Gi\u1ea3i: S = 10cm x 7cm = 70cm\u00b2.<\/p>\n<p><strong>T\u00ednh chi\u1ec1u d\u00e0i ho\u1eb7c chi\u1ec1u r\u1ed9ng cho h\u00ecnh ch\u1eef nh\u1eadt khi bi\u1ebft di\u1ec7n t\u00edch:<\/strong><\/p>\n<p>D\u1ea1ng b\u00e0i n\u00e0y y\u00eau c\u1ea7u h\u1ecdc sinh t\u00ecm m\u1ed9t trong hai c\u1ea1nh c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt khi \u0111\u00e3 bi\u1ebft di\u1ec7n t\u00edch v\u00e0 m\u1ed9t c\u1ea1nh kh\u00e1c.<\/p>\n<ul>\n<li>N\u1ebfu bi\u1ebft chi\u1ec1u r\u1ed9ng: Chi\u1ec1u d\u00e0i = Di\u1ec7n t\u00edch \/ Chi\u1ec1u r\u1ed9ng.<\/li>\n<li>N\u1ebfu bi\u1ebft chi\u1ec1u d\u00e0i: Chi\u1ec1u r\u1ed9ng = Di\u1ec7n t\u00edch \/ Chi\u1ec1u d\u00e0i.<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5: M\u1ed9t m\u1ea3nh v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 di\u1ec7n t\u00edch 50cm\u00b2 v\u00e0 chi\u1ec1u r\u1ed9ng 5cm. T\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a m\u1ea3nh v\u01b0\u1eddn.<\/p>\n<p>Gi\u1ea3i: Chi\u1ec1u d\u00e0i = 50cm\u00b2 \/ 5cm = 10cm.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296663 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-3.jpg\" alt=\"dien-tich-hinh-chu-nhat-3\" 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\"><\/picture><\/p>\n<p>Nh\u1eefng d\u1ea1ng b\u00e0i n\u00e0y gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng l\u00e0m quen v\u1edbi vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc v\u00e0o th\u1ef1c t\u1ebf, \u0111\u1ed3ng th\u1eddi ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1.<\/p>\n<h2>B\u00e0i to\u00e1n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i to\u00e1n tham kh\u1ea3o m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c h\u00e0nh:<\/p>\n<p><strong>B\u00e0i to\u00e1n 1<\/strong>: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 15cm v\u00e0 chi\u1ec1u r\u1ed9ng 6cm.<\/p>\n<p><strong>B\u00e0i to\u00e1n 2<\/strong>: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 di\u1ec7n t\u00edch 120cm\u00b2 v\u00e0 chi\u1ec1u d\u00e0i 15cm. T\u00ecm chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><strong>B\u00e0i to\u00e1n 3<\/strong>: Bi\u1ebft chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 8cm v\u00e0 di\u1ec7n t\u00edch l\u00e0 96cm\u00b2. T\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><strong>B\u00e0i to\u00e1n 4<\/strong>: Chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u1ed9ng l\u1ea1i l\u00e0 26m. N\u1ebfu chi\u1ec1u d\u00e0i h\u00ecnh ch\u1eef nh\u1eadt g\u1ea5p \u0111\u00f4i chi\u1ec1u r\u1ed9ng, h\u00e3y t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><strong>B\u00e0i to\u00e1n 5<\/strong>: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i g\u1ea5p 3 l\u1ea7n chi\u1ec1u r\u1ed9ng. N\u1ebfu chi\u1ec1u r\u1ed9ng l\u00e0 4m, h\u00e3y t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><strong>B\u00e0i to\u00e1n 6<\/strong>: M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt d\u00f9ng \u0111\u1ec3 x\u00e2y d\u1ef1ng nh\u00e0 c\u00f3 chi\u1ec1u d\u00e0i 20m v\u00e0 chi\u1ec1u r\u1ed9ng 15m. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a m\u1ea3nh \u0111\u1ea5t \u0111\u00f3.<\/p>\n<p><strong>B\u00e0i to\u00e1n 7<\/strong>: T\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 36m v\u00e0 chi\u1ec1u d\u00e0i g\u1ea5p \u0111\u00f4i chi\u1ec1u r\u1ed9ng. H\u00e3y t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><strong>B\u00e0i to\u00e1n 8<\/strong>: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh 4 h\u00ecnh vu\u00f4ng nh\u1ecf c\u00f3 c\u1ea1nh 3cm. T\u00ednh di\u1ec7n t\u00edch to\u00e0n b\u1ed9 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296662 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-4.jpg\" alt=\"dien-tich-hinh-chu-nhat-4\" 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\"><\/picture><\/p>\n<h2>M\u1eb9o v\u00e0 l\u01b0u \u00fd khi \u00e1p d\u1ee5ng t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>\u0110\u1ec3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh<strong> di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/strong> nhanh v\u00e0 chu\u1ea9n x\u00e1c nh\u1ea5t, c\u00f3 m\u1ed9t s\u1ed1 m\u1eb9o v\u00e0 l\u01b0u \u00fd m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 quan t\u00e2m. \u0110i\u1ec3n h\u00ecnh nh\u01b0:<\/p>\n<h3>C\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch tr\u00e1nh<\/h3>\n<p><strong>Nh\u1ea7m l\u1eabn gi\u1eefa chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt:<\/strong><\/p>\n<ul>\n<li>L\u1ed7i: Th\u01b0\u1eddng g\u1eb7p khi h\u1ecdc sinh nh\u1ea7m l\u1eabn gi\u1eefa chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng, d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n sai.<\/li>\n<li>C\u00e1ch tr\u00e1nh: Lu\u00f4n \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng v\u00e0 ki\u1ec3m tra l\u1ea1i c\u00e1c k\u00edch th\u01b0\u1edbc tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh.<\/li>\n<\/ul>\n<p><strong>S\u1eed d\u1ee5ng sai \u0111\u01a1n v\u1ecb \u0111o:<\/strong><\/p>\n<ul>\n<li>L\u1ed7i: T\u00ednh to\u00e1n v\u1edbi c\u00e1c \u0111\u01a1n v\u1ecb \u0111o kh\u00f4ng th\u1ed1ng nh\u1ea5t (v\u00ed d\u1ee5: k\u1ebft h\u1ee3p m\u00e9t v\u00e0 centim\u00e9t) g\u00e2y ra k\u1ebft qu\u1ea3 sai l\u1ec7ch.<\/li>\n<li>C\u00e1ch tr\u00e1nh: Ki\u1ec3m tra v\u00e0 chuy\u1ec3n \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c k\u00edch th\u01b0\u1edbc v\u1ec1 c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o tr\u01b0\u1edbc khi t\u00ednh to\u00e1n.<\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296661 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-5.jpg\" alt=\"dien-tich-hinh-chu-nhat-5\" 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\"><\/picture><\/p>\n<p><strong>T\u00ednh to\u00e1n kh\u00f4ng ch\u00ednh x\u00e1c:<\/strong><\/p>\n<ul>\n<li>L\u1ed7i: Sai s\u00f3t trong ph\u00e9p nh\u00e2n ho\u1eb7c t\u00ednh to\u00e1n sai di\u1ec7n t\u00edch.<\/li>\n<li>C\u00e1ch tr\u00e1nh: Ki\u1ec3m tra l\u1ea1i ph\u00e9p nh\u00e2n v\u00e0 s\u1eed d\u1ee5ng m\u00e1y t\u00ednh n\u1ebfu c\u1ea7n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n<p><strong>B\u1ecf qua \u0111i\u1ec1u ki\u1ec7n c\u1ee7a \u0111\u1ec1 b\u00e0i:<\/strong><\/p>\n<ul>\n<li>L\u1ed7i: B\u1ecf qua ho\u1eb7c hi\u1ec3u sai c\u00e1c y\u00eau c\u1ea7u v\u00e0 th\u00f4ng tin quan tr\u1ecdng trong \u0111\u1ec1 b\u00e0i.<\/li>\n<li>C\u00e1ch tr\u00e1nh: \u0110\u1ecdc k\u1ef9 \u0111\u1ec1 b\u00e0i v\u00e0 ghi ch\u00fa c\u00e1c th\u00f4ng tin quan tr\u1ecdng tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u gi\u1ea3i.<\/li>\n<\/ul>\n<p><strong>Qu\u00ean \u00e1p d\u1ee5ng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n:<\/strong><\/p>\n<ul>\n<li>L\u1ed7i: Qu\u00ean m\u1ea5t r\u1eb1ng c\u00e1c g\u00f3c trong h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 g\u00f3c vu\u00f4ng, ho\u1eb7c kh\u00f4ng nh\u1eadn ra c\u01a1 h\u1ed9i \u00e1p d\u1ee5ng ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc kh\u00e1c.<\/li>\n<li>C\u00e1ch tr\u00e1nh: \u00d4n t\u1eadp v\u00e0 ghi nh\u1edb c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/li>\n<\/ul>\n<p>Vi\u1ec7c nh\u1eadn bi\u1ebft v\u00e0 tr\u00e1nh c\u00e1c l\u1ed7i n\u00e0y s\u1ebd gi\u00fap b\u1ea1n t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ch\u00ednh x\u00e1c h\u01a1n, \u0111\u1ed3ng th\u1eddi c\u1ee7ng c\u1ed1 k\u1ef9 n\u0103ng gi\u1ea3i to\u00e1n c\u1ee7a m\u00ecnh.<\/p>\n<h3>M\u1eb9o \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt nhanh v\u00e0 ch\u00ednh x\u00e1c<\/h3>\n<p>\u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt nhanh v\u00e0 ch\u00ednh x\u00e1c, b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p sau m\u00e0 kh\u00f4ng c\u1ea7n li\u1ec7t k\u00ea. \u0110\u1ea7u ti\u00ean, h\u00e3y nh\u1edb ch\u1eafc c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n: Di\u1ec7n t\u00edch = Chi\u1ec1u d\u00e0i x Chi\u1ec1u r\u1ed9ng. \u0110\u00e2y l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng nh\u1ea5t.<\/p>\n<p>Khi b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c s\u1ed1 li\u1ec7u, \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 \u0111\u1ec1u \u1edf c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o. N\u1ebfu kh\u00f4ng, h\u00e3y chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n v\u1ecb \u0111\u1ec3 tr\u00e1nh sai l\u1ec7ch. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n c\u00f3 chi\u1ec1u d\u00e0i t\u00ednh b\u1eb1ng m\u00e9t v\u00e0 chi\u1ec1u r\u1ed9ng b\u1eb1ng centim\u00e9t, chuy\u1ec3n t\u1ea5t c\u1ea3 v\u1ec1 m\u00e9t ho\u1eb7c centim\u00e9t tr\u01b0\u1edbc khi t\u00ednh.<\/p>\n<p>S\u1eed d\u1ee5ng m\u00e1y t\u00ednh l\u00e0 m\u1ed9t c\u00e1ch tuy\u1ec7t v\u1eddi \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ph\u00e9p nh\u00e2n c\u1ee7a b\u1ea1n ch\u00ednh x\u00e1c. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch khi b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi nh\u1eefng con s\u1ed1 l\u1edbn ho\u1eb7c mu\u1ed1n ki\u1ec3m tra l\u1ea1i k\u1ebft qu\u1ea3 c\u1ee7a m\u00ecnh.<\/p>\n<p>M\u1ed9t m\u1eb9o h\u1eefu \u00edch kh\u00e1c l\u00e0 v\u1ebd m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt minh h\u1ecda v\u1edbi c\u00e1c k\u00edch th\u01b0\u1edbc \u0111\u00e3 cho. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n h\u00ecnh dung r\u00f5 r\u00e0ng v\u1ea5n \u0111\u1ec1 m\u00e0 c\u00f2n gi\u00fap b\u1ea1n ki\u1ec3m tra l\u1ea1i xem m\u00ecnh \u0111\u00e3 s\u1eed d\u1ee5ng \u0111\u00fang chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng hay kh\u00f4ng.<\/p>\n<p>Cu\u1ed1i c\u00f9ng, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean s\u1ebd gi\u00fap b\u1ea1n nhanh ch\u00f3ng v\u00e0 ch\u00ednh x\u00e1c h\u01a1n trong vi\u1ec7c t\u00ednh to\u00e1n di\u1ec7n t\u00edch cho h\u00ecnh ch\u1eef nh\u1eadt. C\u00e0ng l\u00e0m nhi\u1ec1u b\u00e0i t\u1eadp, b\u1ea1n c\u00e0ng d\u1ec5 d\u00e0ng nh\u1edb c\u00f4ng th\u1ee9c v\u00e0 \u00e1p d\u1ee5ng n\u00f3 m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean.<\/p>\n<h2>\u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a vi\u1ec7c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/h2>\n<p>C\u00f3 th\u1ec3 nh\u1eadn th\u1ea5y, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m to\u00e1n h\u1ecdc c\u01a1 b\u1ea3n m\u00e0 c\u00f2n r\u1ea5t quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c c\u1ee7a cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n<p>Trong to\u00e1n h\u1ecdc v\u00e0 h\u00ecnh h\u1ecdc, vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh cho ch\u1eef nh\u1eadt gi\u00fap h\u1ecdc sinh ph\u00e1t tri\u1ec3n k\u1ef9 n\u0103ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 v\u00e0 t\u01b0 duy logic. N\u00f3 c\u0169ng l\u00e0 n\u1ec1n t\u1ea3ng cho vi\u1ec7c h\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m h\u00ecnh h\u1ecdc ph\u1ee9c t\u1ea1p h\u01a1n, nh\u01b0 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ph\u1ee9c t\u1ea1p h\u01a1n hay th\u1eadm ch\u00ed trong vi\u1ec7c nghi\u00ean c\u1ee9u v\u1ec1 kh\u00f4ng gian v\u00e0 h\u00ecnh h\u1ecdc kh\u00f4ng gian.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-296660 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-chu-nhat-6.jpg\" alt=\"dien-tich-hinh-chu-nhat-6\" 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\"><\/picture><\/p>\n<p>Trong \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y, vi\u1ec7c t\u00ednh to\u00e1n <strong>di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/strong> c\u00f3 \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i, t\u1eeb x\u00e2y d\u1ef1ng \u0111\u1ebfn thi\u1ebft k\u1ebf n\u1ed9i th\u1ea5t. Trong x\u00e2y d\u1ef1ng, n\u00f3 gi\u00fap x\u00e1c \u0111\u1ecbnh l\u01b0\u1ee3ng v\u1eadt li\u1ec7u c\u1ea7n thi\u1ebft, t\u1eeb xi m\u0103ng cho \u0111\u1ebfn s\u01a1n t\u01b0\u1eddng. Khi thi\u1ebft k\u1ebf n\u1ed9i th\u1ea5t, vi\u1ec7c t\u00ednh to\u00e1n di\u1ec7n t\u00edch kh\u00f4ng gian s\u1ebd gi\u00fap b\u1ea1n s\u1eafp x\u1ebfp \u0111\u1ed3 \u0111\u1ea1c m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd, t\u1eadn d\u1ee5ng t\u1ed1i \u0111a kh\u00f4ng gian s\u1eed d\u1ee5ng.<\/p>\n<p>Ngo\u00e0i ra, vi\u1ec7c n\u00e0y c\u0169ng quan tr\u1ecdng trong c\u00e1c l\u0129nh v\u1ef1c nh\u01b0 l\u1eadp k\u1ebf ho\u1ea1ch v\u01b0\u1eddn t\u01b0\u1ee3c, thi\u1ebft k\u1ebf th\u1eddi trang, v\u00e0 th\u1eadm ch\u00ed trong c\u00e1c ho\u1ea1t \u0111\u1ed9ng gi\u1ea3i tr\u00ed nh\u01b0 b\u1ed1 tr\u00ed b\u00e0n c\u1edd ho\u1eb7c s\u1eafp x\u1ebfp c\u00e1c m\u1ea3nh gh\u00e9p puzzle.<\/p>\n<h2>T\u1ea1m k\u1ebft<\/h2>\n<p>Sau khi t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch t\u00ednh <strong>di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/strong> trong b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n h\u00e3y th\u1eed t\u00ednh di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t c\u0103n ph\u00f2ng, m\u1ed9t m\u1ea3nh v\u01b0\u1eddn, ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 m\u1ed9t t\u1ea5m v\u1ea3i. Qua \u0111\u00f3, b\u1ea1n s\u1ebd th\u1ea5y r\u1eb1ng vi\u1ec7c hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n trong h\u1ecdc t\u1eadp m\u00e0 c\u00f2n trong r\u1ea5t nhi\u1ec1u ho\u1ea1t \u0111\u1ed9ng c\u1ee7a cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n<p>Xem th\u00eam:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-thoi-gian\/\">V\u1eadn t\u1ed1c l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh th\u1eddi gian, v\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cach-lam-thiep-don-gian-ma-dep\/\">C\u00e1c c\u00e1ch l\u00e0m thi\u1ec7p b\u1eb1ng gi\u1ea5y A4 \u0111\u01a1n gi\u1ea3n, d\u1ec5 l\u00e0m, \u00fd ngh\u0129a<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 l\u00e0 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n l\u1edbp 4, gi\u00fap b\u00e9 l\u00e0m quen v\u1edbi ph\u00e9p nh\u00e2n v\u00e0 \u0111o l\u01b0\u1eddng. C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt l\u1edbp 4 \u0111\u01a1n gi\u1ea3n: S = d\u00e0i x r\u1ed9ng. B\u00e0i vi\u1ebft h\u01b0\u1edbng d\u1eabn chi ti\u1ebft l\u00fd thuy\u1ebft SGK, v\u00ed [&hellip;]<\/p>\n","protected":false},"author":83,"featured_media":296666,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"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 v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\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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