{"id":122726,"date":"2025-03-27T16:39:32","date_gmt":"2025-03-27T09:39:32","guid":{"rendered":"https:\/\/phongvu.vn\/cong-nghe\/?p=122726"},"modified":"2025-03-27T16:39:35","modified_gmt":"2025-03-27T09:39:35","slug":"cach-tinh-dien-tich-hinh-vuong","status":"publish","type":"post","link":"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/","title":{"rendered":"M\u00e1ch b\u1ea1n c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng c\u00f9ng b\u00e0i t\u1eadp (c\u00f3 \u0111\u00e1p \u00e1n)"},"content":{"rendered":"\n<p>H\u00ecnh vu\u00f4ng l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh h\u1ecdc \u0111\u01a1n gi\u1ea3n nh\u01b0ng l\u1ea1i r\u1ea5t quen thu\u1ed9c trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y. V\u1edbi \u0111\u1eb7c \u0111i\u1ec3m c\u00e1c c\u1ea1nh b\u1eb1ng nhau v\u00e0 c\u00e1c g\u00f3c vu\u00f4ng, h\u00ecnh vu\u00f4ng d\u1ec5 d\u00e0ng nh\u1eadn di\u1ec7n v\u00e0 t\u00ednh to\u00e1n. N\u1ebfu b\u1ea1n \u0111ang t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng, th\u00ec c\u00f4ng th\u1ee9c r\u1ea5t d\u1ec5 nh\u1edb v\u00e0 \u00e1p d\u1ee5ng. Trong b\u00e0i vi\u1ebft n\u00e0y, h\u00e3y c\u00f9ng <a href=\"https:\/\/phongvu.vn\/cong-nghe\">Phong V\u0169 Tech News<\/a> kh\u00e1m ph\u00e1 c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng, k\u00e8m theo m\u1ed9t b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 luy\u1ec7n t\u1eadp ngay nh\u00e9!<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<ul>\n<li><a href=\"https:\/\/phongvu.vn\/cong-nghe\/7-hang-dang-thuc-dang-nho\/\">7 h\u1eb1ng \u0111\u1eb3ng th\u1ee9c \u0111\u00e1ng nh\u1edb v\u00e0 c\u00e1ch v\u1eadn d\u1ee5ng trong b\u00e0i t\u1eadp to\u00e1n<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/phongvu.vn\/cong-nghe\/cong-thuc-tinh-dien-tich-hinh-chu-nhat\/\">Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt: \u0110\u1ecbnh ngh\u0129a, c\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/phongvu.vn\/cong-nghe\/dien-tich-hinh-thang\/\">\u201cB\u1ecf t\u00fai\u201d 4 c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thang (vu\u00f4ng, c\u00e2n, th\u01b0\u1eddng) k\u00e8m b\u00e0i t\u1eadp chu\u1ea9n nh\u1ea5t 2025<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_55 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6a2f85b1519b9\" ><span class=\"\"><span style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" 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href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Hinh_vuong_la_gi\" title=\"H\u00ecnh vu\u00f4ng l\u00e0 g\u00ec?\">H\u00ecnh vu\u00f4ng l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Cong_thuc_tinh_dien_tich_hinh_vuong_day_du_nhat\" title=\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Cong_thuc_tinh_chu_vi_hinh_vuong_chi_tiet_nhat\" title=\"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng chi ti\u1ebft nh\u1ea5t\">C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng chi ti\u1ebft nh\u1ea5t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Bai_tap_tinh_dien_tich_hinh_vuong_kem_dap_an\" title=\"B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng k\u00e8m \u0111\u00e1p \u00e1n\">B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng k\u00e8m \u0111\u00e1p \u00e1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Luu_y_khi_tinh_dien_tich_hinh_vuong\" title=\"L\u01b0u \u00fd khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng\">L\u01b0u \u00fd khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/phongvu.vn\/cong-nghe\/cach-tinh-dien-tich-hinh-vuong\/#Tong_ket\" title=\"T\u1ed5ng k\u1ebft\">T\u1ed5ng k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Hinh_vuong_la_gi\"><\/span><strong>H\u00ecnh vu\u00f4ng l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>H\u00ecnh vu\u00f4ng l\u00e0 m\u1ed9t lo\u1ea1i h\u00ecnh h\u1ecdc \u0111\u1eb7c bi\u1ec7t trong h\u00ecnh h\u1ecdc ph\u1eb3ng. N\u00f3 c\u00f3 4 c\u1ea1nh \u0111\u1ec1u nhau v\u00e0 4 g\u00f3c vu\u00f4ng (m\u1ed7i g\u00f3c b\u1eb1ng 90 \u0111\u1ed9). \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u1ec1u c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau v\u00e0 m\u1ed7i g\u00f3c trong h\u00ecnh vu\u00f4ng \u0111\u1ec1u t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c vu\u00f4ng. H\u00ecnh vu\u00f4ng v\u1eeba l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt (khi t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh \u0111\u1ec1u b\u1eb1ng nhau), v\u1eeba l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh thoi (khi t\u1ea5t c\u1ea3 c\u00e1c g\u00f3c \u0111\u1ec1u vu\u00f4ng). Nh\u1edd v\u00e0o c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y, h\u00ecnh vu\u00f4ng r\u1ea5t d\u1ec5 nh\u1eadn di\u1ec7n v\u00e0 t\u00ednh to\u00e1n trong c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-1024x640.jpg\" alt=\"Kh\u00e1i nieenmj v\u1ec1 h\u00ecnh vu\u00f4ng.\" class=\"wp-image-122835\" width=\"1024\" height=\"640\" srcset=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-1024x640.jpg 1024w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-300x188.jpg 300w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-768x480.jpg 768w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-150x94.jpg 150w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-600x375.jpg 600w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-696x435.jpg 696w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-1392x870.jpg 1392w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-1068x668.jpg 1068w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-672x420.jpg 672w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1-1344x840.jpg 1344w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-1.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\"><figcaption class=\"wp-element-caption\">Kh\u00e1i nieenmj v\u1ec1 h\u00ecnh vu\u00f4ng.<\/figcaption><\/figure>\n\n\n\n<p>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng l\u00e0:<\/p>\n\n\n\n<ul>\n<li><strong>4 c\u1ea1nh b\u1eb1ng nhau:<\/strong> M\u1ecdi c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u1ec1u c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau.<\/li>\n\n\n\n<li><strong>4 g\u00f3c vu\u00f4ng:<\/strong> M\u1ed7i g\u00f3c c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u1ec1u l\u00e0 g\u00f3c vu\u00f4ng (90 \u0111\u1ed9).<\/li>\n\n\n\n<li><strong>C\u00e1c \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau:<\/strong> \u0110\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng kh\u00f4ng ch\u1ec9 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u00e0 c\u00f2n vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/li>\n<\/ul>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_hinh_vuong_day_du_nhat\"><\/span><strong>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 th\u1ec3 t\u00ednh d\u1ef1a tr\u00ean \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a n\u00f3. C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t l\u00e0: S = a\u00b2<\/p>\n\n\n\n<p>Trong \u0111\u00f3:<\/p>\n\n\n\n<ul>\n<li>S l\u00e0 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng.<\/li>\n\n\n\n<li>a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-1024x640.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng.\" class=\"wp-image-122836\" width=\"1024\" height=\"640\" srcset=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-1024x640.jpg 1024w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-300x188.jpg 300w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-768x480.jpg 768w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-150x94.jpg 150w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-600x375.jpg 600w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-696x435.jpg 696w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-1392x870.jpg 1392w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-1068x668.jpg 1068w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-672x420.jpg 672w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3-1344x840.jpg 1344w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-3.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\"><figcaption class=\"wp-element-caption\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng.<\/figcaption><\/figure>\n\n\n\n<p><strong>Gi\u1ea3i th\u00edch:<\/strong> V\u00ec h\u00ecnh vu\u00f4ng c\u00f3 t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh b\u1eb1ng nhau, ta ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch. C\u00f4ng th\u1ee9c S = a x a c\u00f3 ngh\u0129a l\u00e0 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng b\u1eb1ng \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3 (hay b\u00ecnh ph\u01b0\u01a1ng c\u1ea1nh).<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5:<\/strong> N\u1ebfu m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 5 cm, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng s\u1ebd l\u00e0: S = 5 x 5 = 25 (cm\u00b2)<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_chu_vi_hinh_vuong_chi_tiet_nhat\"><\/span><strong>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng chi ti\u1ebft nh\u1ea5t<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Chu vi c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c r\u1ea5t \u0111\u01a1n gi\u1ea3n v\u00ec t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u1ec1u b\u1eb1ng nhau. C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng l\u00e0: P = 4 x a<\/p>\n\n\n\n<p>Trong \u0111\u00f3:<\/p>\n\n\n\n<ul>\n<li>P l\u00e0 chu vi c\u1ee7a h\u00ecnh vu\u00f4ng.<\/li>\n\n\n\n<li>a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-1024x640.jpg\" alt=\"C\u00e1ch t\u00ednh chu vi h\u00ecnh vu\u00f4ng.\" class=\"wp-image-122837\" width=\"1024\" height=\"640\" srcset=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-1024x640.jpg 1024w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-300x188.jpg 300w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-768x480.jpg 768w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-150x94.jpg 150w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-600x375.jpg 600w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-696x435.jpg 696w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-1392x870.jpg 1392w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-1068x668.jpg 1068w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-672x420.jpg 672w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2-1344x840.jpg 1344w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-2.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\"><figcaption class=\"wp-element-caption\">C\u00e1ch t\u00ednh chu vi h\u00ecnh vu\u00f4ng.<\/figcaption><\/figure>\n\n\n\n<p><strong>Gi\u1ea3i th\u00edch:<\/strong> H\u00ecnh vu\u00f4ng c\u00f3 4 c\u1ea1nh v\u00e0 t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh \u0111\u1ec1u c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau. Do \u0111\u00f3, chu vi h\u00ecnh vu\u00f4ng b\u1eb1ng 4 l\u1ea7n \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh.<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5:<\/strong> N\u1ebfu \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0 6 cm, th\u00ec chu vi c\u1ee7a h\u00ecnh vu\u00f4ng s\u1ebd l\u00e0: P = 4 \u00d7 6 = 24\u2009(cm).<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Bai_tap_tinh_dien_tich_hinh_vuong_kem_dap_an\"><\/span><strong>B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng k\u00e8m \u0111\u00e1p \u00e1n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>B\u00e0i 1:<\/strong> M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 5 cm. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u00f3.<\/p>\n\n\n\n<p><strong>B\u00e0i 2:<\/strong> T\u00ednh di\u1ec7n t\u00edch m\u1ed9t h\u00ecnh vu\u00f4ng bi\u1ebft chu vi c\u1ee7a n\u00f3 l\u00e0 20 cm. <\/p>\n\n\n\n<p><strong>B\u00e0i 3:<\/strong> M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 \u0111\u01b0\u1eddng ch\u00e9o d\u00e0i 10 cm. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u00f3. <\/p>\n\n\n\n<p><strong>B\u00e0i 4: <\/strong>Di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh vu\u00f4ng l\u00e0 36 cm\u00b2. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u00f3.<\/p>\n\n\n\n<p><strong>B\u00e0i 5: <\/strong>M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 12.5 m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t \u0111\u00f3. <\/p>\n\n\n\n<p><strong>B\u00e0i 6:<\/strong> M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch b\u1eb1ng di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 9 cm v\u00e0 chi\u1ec1u r\u1ed9ng 4 cm. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng. <\/p>\n\n\n\n<p><strong>B\u00e0i 7:<\/strong> M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh t\u0103ng l\u00ean g\u1ea5p \u0111\u00f4i. H\u1ecfi di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng m\u1edbi t\u0103ng l\u00ean g\u1ea5p m\u1ea5y l\u1ea7n di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng ban \u0111\u1ea7u? <\/p>\n\n\n\n<p><strong>B\u00e0i 8:<\/strong> Ng\u01b0\u1eddi ta mu\u1ed1n l\u00e1t g\u1ea1ch h\u00ecnh vu\u00f4ng c\u1ea1nh 20 cm cho m\u1ed9t n\u1ec1n nh\u00e0 h\u00ecnh vu\u00f4ng c\u1ea1nh 4 m. C\u1ea7n bao nhi\u00eau vi\u00ean g\u1ea1ch \u0111\u1ec3 l\u00e1t k\u00edn n\u1ec1n nh\u00e0 \u0111\u00f3?<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-1024x640.jpg\" alt=\"B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng.\" class=\"wp-image-122838\" width=\"1024\" height=\"640\" srcset=\"https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-1024x640.jpg 1024w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-300x188.jpg 300w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-768x480.jpg 768w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-150x94.jpg 150w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-600x375.jpg 600w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-696x435.jpg 696w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-1392x870.jpg 1392w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-1068x668.jpg 1068w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-672x420.jpg 672w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4-1344x840.jpg 1344w, https:\/\/phongvu.vn\/cong-nghe\/wp-content\/uploads\/2025\/03\/dien-tich-hinh-vuong-4.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\"><figcaption class=\"wp-element-caption\">B\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng.<\/figcaption><\/figure>\n\n\n\n<p>\u0110\u00e1p \u00e1n:<\/p>\n\n\n\n<ul>\n<li>B\u00e0i 1: \u0110\u00e1p \u00e1n: 25 cm\u00b2<\/li>\n\n\n\n<li>B\u00e0i 2: \u0110\u00e1p \u00e1n: 25 cm\u00b2<\/li>\n\n\n\n<li>B\u00e0i 3: \u0110\u00e1p \u00e1n: 50 cm\u00b2<\/li>\n\n\n\n<li>B\u00e0i 4: \u0110\u00e1p \u00e1n: 6 cm<\/li>\n\n\n\n<li>B\u00e0i 5: \u0110\u00e1p \u00e1n: 156.25 m\u00b2<\/li>\n\n\n\n<li>B\u00e0i 6: \u0110\u00e1p \u00e1n: 6 cm<\/li>\n\n\n\n<li>B\u00e0i 7: \u0110\u00e1p \u00e1n: 4 l\u1ea7n<\/li>\n\n\n\n<li>B\u00e0i 8: \u0110\u00e1p \u00e1n: 400 vi\u00ean g\u1ea1ch<\/li>\n<\/ul>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Luu_y_khi_tinh_dien_tich_hinh_vuong\"><\/span><strong>L\u01b0u \u00fd khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c t\u00ednh d\u1ef1a tr\u00ean \u0111\u1ed9 d\u00e0i c\u1ea1nh, v\u00ec v\u1eady b\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u01a1n v\u1ecb \u0111o c\u1ee7a c\u1ea1nh l\u00e0 nh\u1ea5t qu\u00e1n. N\u1ebfu \u0111\u01a1n v\u1ecb \u0111o c\u1ee7a c\u1ea1nh l\u00e0 cm, th\u00ec di\u1ec7n t\u00edch s\u1ebd l\u00e0 cm\u00b2; n\u1ebfu c\u1ea1nh \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng m, di\u1ec7n t\u00edch s\u1ebd l\u00e0 m\u00b2. N\u1ebfu b\u1ea1n \u0111ang l\u00e0m b\u00e0i to\u00e1n v\u1edbi c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c nhau (v\u00ed d\u1ee5, m\u1ed9t c\u1ea1nh t\u00ednh b\u1eb1ng cm v\u00e0 m\u1ed9t c\u1ea1nh t\u00ednh b\u1eb1ng m), h\u00e3y chuy\u1ec3n \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c \u0111\u01a1n v\u1ecb v\u1ec1 c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh di\u1ec7n t\u00edch. V\u00ed d\u1ee5, n\u1ebfu c\u1ea1nh l\u00e0 2 m, b\u1ea1n n\u00ean chuy\u1ec3n \u0111\u1ed5i sang cm (1 m = 100 cm) \u0111\u1ec3 d\u1ec5 d\u00e0ng t\u00ednh to\u00e1n.<\/p>\n\n\n\n<p>N\u1ebfu b\u00e0i to\u00e1n y\u00eau c\u1ea7u t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng khi c\u1ea1nh thay \u0111\u1ed5i (nh\u01b0 khi t\u0103ng g\u1ea5p \u0111\u00f4i ho\u1eb7c gi\u1ea3m \u0111i m\u1ed9t ph\u1ea7n), b\u1ea1n c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c sau khi t\u00ednh l\u1ea1i c\u1ea1nh. Ngo\u00e0i ra, sau khi t\u00ednh to\u00e1n di\u1ec7n t\u00edch, b\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra l\u1ea1i \u0111\u00e1p \u00e1n b\u1eb1ng c\u00e1ch xem x\u00e9t c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a h\u00ecnh vu\u00f4ng. V\u00ed d\u1ee5, n\u1ebfu b\u00e0i to\u00e1n n\u00f3i r\u1eb1ng h\u00ecnh vu\u00f4ng c\u00f3 di\u1ec7n t\u00edch 36 cm\u00b2, \u0111\u1ed9 d\u00e0i c\u1ea1nh s\u1ebd l\u1ea3 6 cm.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket\"><\/span><strong>T\u1ed5ng k\u1ebft<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1eady l\u00e0, ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng, b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 t\u00ednh di\u1ec7n t\u00edch nhanh ch\u00f3ng v\u1edbi c\u00f4ng th\u1ee9c S=a\u00b2. Hy v\u1ecdng b\u00e0i vi\u1ebft v\u00e0 b\u00e0i t\u1eadp \u0111\u00e3 gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng. \u0110\u1eebng qu\u00ean th\u1eed s\u1ee9c v\u1edbi c\u00e1c b\u00e0i t\u1eadp kh\u00e1c \u0111\u1ec3 r\u00e8n luy\u1ec7n th\u00eam k\u1ef9 n\u0103ng nh\u00e9! Phong V\u0169 ch\u00fac b\u1ea1n h\u1ecdc t\u1ed1t v\u00e0 c\u00f3 th\u00eam ni\u1ec1m vui v\u1edbi to\u00e1n h\u1ecdc!<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00ecnh vu\u00f4ng l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh h\u1ecdc \u0111\u01a1n gi\u1ea3n nh\u01b0ng l\u1ea1i r\u1ea5t quen thu\u1ed9c trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y. V\u1edbi \u0111\u1eb7c \u0111i\u1ec3m c\u00e1c c\u1ea1nh b\u1eb1ng nhau v\u00e0 c\u00e1c g\u00f3c vu\u00f4ng, h\u00ecnh vu\u00f4ng d\u1ec5 d\u00e0ng nh\u1eadn di\u1ec7n v\u00e0 t\u00ednh to\u00e1n. N\u1ebfu b\u1ea1n \u0111ang t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng, th\u00ec c\u00f4ng [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":122839,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[1029],"tags":[],"_links":{"self":[{"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/posts\/122726"}],"collection":[{"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/comments?post=122726"}],"version-history":[{"count":3,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/posts\/122726\/revisions"}],"predecessor-version":[{"id":122840,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/posts\/122726\/revisions\/122840"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/media\/122839"}],"wp:attachment":[{"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/media?parent=122726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/categories?post=122726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phongvu.vn\/cong-nghe\/wp-json\/wp\/v2\/tags?post=122726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}