{"id":301326,"date":"2023-12-30T20:38:31","date_gmt":"2023-12-30T13:38:31","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=301326"},"modified":"2025-10-14T16:00:55","modified_gmt":"2025-10-14T09:00:55","slug":"chu-vi-hinh-thoi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-thoi\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi: C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u00e0 v\u00ed d\u1ee5 chi ti\u1ebft"},"content":{"rendered":"<p>Chu vi h\u00ecnh thoi l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c To\u00e1n h\u1ecdc c\u01a1 b\u1ea3n v\u00e0 quan tr\u1ecdng, xu\u1ea5t hi\u1ec7n th\u01b0\u1eddng xuy\u00ean trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u1ed5 th\u00f4ng v\u00e0 c\u00e1c b\u00e0i to\u00e1n th\u1ef1c t\u1ebf. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i ai c\u0169ng n\u1eafm v\u1eefng t\u1ea5t c\u1ea3 c\u00e1c c\u00f4ng th\u1ee9c v\u00e0 d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan.<\/p>\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y, Ho\u00e0ng H\u00e0 Mobile s\u1ebd c\u00f9ng b\u1ea1n h\u1ec7 th\u1ed1ng l\u1ea1i to\u00e0n b\u1ed9 ki\u1ebfn th\u1ee9c t\u1eeb A-Z: t\u1eeb \u0111\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p, cho \u0111\u1ebfn c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft \u0111\u1ec3 b\u1ea1n d\u1ec5 d\u00e0ng \u00f4n t\u1eadp v\u00e0 \u00e1p d\u1ee5ng.<\/p>\n<h2>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh thoi<\/h2>\n<p>\u0110\u1ec3 nh\u1eadn bi\u1ebft m\u1ed9t t\u1ee9 gi\u00e1c c\u00f3 ph\u1ea3i l\u00e0 h\u00ecnh thoi hay kh\u00f4ng, b\u1ea1n c\u00f3 th\u1ec3 d\u1ef1a v\u00e0o c\u00e1c d\u1ea5u hi\u1ec7u sau:<\/p>\n<ul>\n<li>T\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau l\u00e0 h\u00ecnh thoi.<\/li>\n<li>H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau l\u00e0 h\u00ecnh thoi.<\/li>\n<li>H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau l\u00e0 h\u00ecnh thoi.<\/li>\n<li>H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c l\u00e0 h\u00ecnh thoi.<\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-1-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-1-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-301339 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-1.jpg\" alt=\"chu-vi-hinh-thoi-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2><span style=\"font-weight: 400;\">H\u00ecnh thoi c\u00f3 t\u00ednh ch\u1ea5t n\u00e0o?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u chu vi h\u00ecnh thoi th\u00ec m\u1ecdi ng\u01b0\u1eddi c\u1ea7n t\u00ecm hi\u1ec3u d\u1ea1ng h\u00ecnh h\u1ecdc n\u00e0y c\u00f3 t\u00ednh ch\u1ea5t nh\u01b0 th\u1ebf n\u00e0o? Sau \u0111\u00e2y l\u00e0 v\u00e0i t\u00ednh ch\u1ea5t trong h\u00ecnh thoi:<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-2-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-2-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-301340 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-2.jpg\" alt=\"chu-vi-hinh-thoi-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi g\u1ed3m t\u1ea5t c\u1ea3 nh\u1eefng t\u00ednh ch\u1ea5t c\u00f3 trong h\u00ecnh b\u00ecnh h\u00e0nh. Ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ednh ch\u1ea5t c\u00f3 nh\u1eefng c\u1ea1nh \u0111\u1ed1i b\u1eb1ng nhau v\u00e0 song song c\u00f9ng nhau, t\u00ednh ch\u1ea5t c\u00f3 nh\u1eefng g\u00f3c \u0111\u1ed1i v\u1edbi s\u1ed1 \u0111\u1ed9 b\u1eb1ng nhau, 2 \u0111\u01b0\u1eddng ch\u00e9o trong h\u00ecnh c\u1eaft nhau \u1edf trung \u0111i\u1ec3m t\u1eebng \u0111\u01b0\u1eddng.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi bao g\u1ed3m nh\u1eefng g\u00f3c \u0111\u1ed1i c\u00f3 s\u1ed1 \u0111\u1ed9 nh\u01b0 nhau, t\u1ed5ng t\u1ea5t c\u1ea3 c\u00e1c g\u00f3c c\u1ee7a h\u00ecnh thoi = 360 \u0111\u1ed9.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi g\u1ed3m 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau \u1edf trung \u0111i\u1ec3m t\u1eebng \u0111\u01b0\u1eddng v\u00e0 vu\u00f4ng g\u00f3c.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">H\u00ecnh thoi g\u1ed3m 2 \u0111\u01b0\u1eddng ch\u00e9o \u0111\u01b0\u1ee3c coi nh\u01b0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c t\u1ea5t c\u1ea3 c\u00e1c g\u00f3c c\u1ee7a h\u00ecnh thoi.<\/span><\/li>\n<\/ul>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp ph\u1ed5 bi\u1ebfn<\/h2>\n<p>V\u1ec1 c\u01a1 b\u1ea3n, c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi r\u1ea5t \u0111\u01a1n gi\u1ea3n. Ch\u00fang ta s\u1ebd \u0111i t\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c \u0111\u1ebfn c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp m\u1edf r\u1ed9ng th\u01b0\u1eddng g\u1eb7p.<\/p>\n<h3>D\u1ea1ng 1: T\u00ednh chu vi khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh<\/h3>\n<p>\u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp c\u01a1 b\u1ea3n nh\u1ea5t. V\u00ec h\u00ecnh thoi c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau, ta ch\u1ec9 c\u1ea7n l\u1ea5y \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh nh\u00e2n v\u1edbi 4.<\/p>\n<p><strong>P = a x 4<\/strong><\/p>\n<p><em>Trong \u0111\u00f3:<\/em><\/p>\n<ul>\n<li><strong>P:<\/strong>\u00a0l\u00e0 chu vi h\u00ecnh thoi.<\/li>\n<li><strong>a:<\/strong>\u00a0l\u00e0 \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh thoi.<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5:<\/strong>\u00a0M\u1ed9t h\u00ecnh thoi c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 7cm. H\u1ecfi chu vi c\u1ee7a h\u00ecnh thoi \u0111\u00f3 l\u00e0 bao nhi\u00eau?<picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-3-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-3-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-301341 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-3.jpg\" alt=\"chu-vi-hinh-thoi-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em>\u00a0\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c, ta c\u00f3 chu vi h\u00ecnh thoi l\u00e0: P = 7 x 4 = 28 (cm).<\/p>\n<h3>D\u1ea1ng 2: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh khi bi\u1ebft chu vi<\/h3>\n<p>\u0110\u00e2y l\u00e0 b\u00e0i to\u00e1n ng\u01b0\u1ee3c c\u1ee7a d\u1ea1ng 1. Khi \u0111\u00e3 bi\u1ebft chu vi, ta ch\u1ec9 c\u1ea7n chia cho 4 \u0111\u1ec3 t\u00ecm ra \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh.<\/p>\n<p><strong>a = P \/ 4<\/strong><\/p>\n<p><strong>V\u00ed d\u1ee5:<\/strong>\u00a0M\u1ed9t h\u00ecnh thoi c\u00f3 chu vi l\u00e0 60cm. T\u00ednh \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh thoi.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em>\u00a0\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c, \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh thoi l\u00e0: a = 60 \/ 4 = 15 (cm).<\/p>\n<h3>D\u1ea1ng 3: T\u00ednh chu vi khi bi\u1ebft \u0111\u1ed9 d\u00e0i 2 \u0111\u01b0\u1eddng ch\u00e9o (Quan tr\u1ecdng)<\/h3>\n<p>\u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp n\u00e2ng cao h\u01a1n, \u0111\u00f2i h\u1ecfi b\u1ea1n ph\u1ea3i v\u1eadn d\u1ee5ng \u0111\u1ecbnh l\u00fd Pytago. Khi hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi c\u1eaft nhau, ch\u00fang t\u1ea1o ra 4 tam gi\u00e1c vu\u00f4ng b\u1eb1ng nhau. M\u1ed7i c\u1ea1nh c\u1ee7a h\u00ecnh thoi ch\u00ednh l\u00e0 c\u1ea1nh huy\u1ec1n c\u1ee7a c\u00e1c tam gi\u00e1c vu\u00f4ng \u0111\u00f3.<picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-6.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-6-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-6-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-301344 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-6.jpg\" alt=\"chu-vi-hinh-thoi-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><strong>B\u01b0\u1edbc 1: T\u00ecm \u0111\u1ed9 d\u00e0i hai n\u1eeda \u0111\u01b0\u1eddng ch\u00e9o.<\/strong>\u00a0G\u1ecdi \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 d1 v\u00e0 d2.<\/p>\n<p><strong>B\u01b0\u1edbc 2: D\u00f9ng \u0111\u1ecbnh l\u00fd Pytago \u0111\u1ec3 t\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh (a).<\/strong><\/p>\n<p><strong>a\u00b2 = (d1\/2)\u00b2 + (d2\/2)\u00b2<\/strong><\/p>\n<p><strong>=&gt; a = \u221a[(d1\/2)\u00b2 + (d2\/2)\u00b2]<\/strong><\/p>\n<p><strong>B\u01b0\u1edbc 3: T\u00ednh chu vi.<\/strong><\/p>\n<p><strong>P = a x 4<\/strong><\/p>\n<p><strong>V\u00ed d\u1ee5:<\/strong>\u00a0T\u00ednh chu vi c\u1ee7a m\u1ed9t h\u00ecnh thoi, bi\u1ebft \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o l\u1ea7n l\u01b0\u1ee3t l\u00e0 16cm v\u00e0 30cm.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<ul>\n<li>N\u1eeda \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o th\u1ee9 nh\u1ea5t l\u00e0: 16 \/ 2 = 8 (cm).<\/li>\n<li>N\u1eeda \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o th\u1ee9 hai l\u00e0: 30 \/ 2 = 15 (cm).<\/li>\n<li>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd Pytago, \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh thoi l\u00e0: a = \u221a(8\u00b2 + 15\u00b2) = \u221a(64 + 225) = \u221a289 = 17 (cm).<\/li>\n<li>V\u1eady chu vi c\u1ee7a h\u00ecnh thoi l\u00e0: P = 17 x 4 = 68 (cm).<\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-7.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-7-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-7-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-301345 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-7.jpg\" alt=\"chu-vi-hinh-thoi-7\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2>Ki\u1ebfn th\u1ee9c m\u1edf r\u1ed9ng: C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi<\/h2>\n<p>B\u00ean c\u1ea1nh chu vi, di\u1ec7n t\u00edch c\u0169ng l\u00e0 m\u1ed9t th\u00f4ng s\u1ed1 quan tr\u1ecdng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 2 c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi ph\u1ed5 bi\u1ebfn nh\u1ea5t:<\/p>\n<p><strong>1. T\u00ednh di\u1ec7n t\u00edch qua hai \u0111\u01b0\u1eddng ch\u00e9o:<\/strong><\/p>\n<p><strong>S = \u00bd x (d1 x d2)<\/strong><\/p>\n<p><em>Trong \u0111\u00f3 d1 v\u00e0 d2 l\u00e0 \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o.<\/em><\/p>\n<p><strong>2. T\u00ednh di\u1ec7n t\u00edch qua chi\u1ec1u cao v\u00e0 c\u1ea1nh \u0111\u00e1y:<\/strong><\/p>\n<p><strong>S = h x a<\/strong><\/p>\n<p><em>Trong \u0111\u00f3 h l\u00e0 chi\u1ec1u cao v\u00e0 a l\u00e0 c\u1ea1nh \u0111\u00e1y t\u01b0\u01a1ng \u1ee9ng.<\/em><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-4-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-4-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-301342 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-4.jpg\" alt=\"chu-vi-hinh-thoi-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng v\u1ec1 chu vi h\u00ecnh thoi (c\u00f3 l\u1eddi gi\u1ea3i)<\/h2>\n<p>H\u00e3y c\u00f9ng th\u1ef1c h\u00e0nh v\u1edbi c\u00e1c b\u00e0i t\u1eadp d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c nh\u00e9!<\/p>\n<p><strong>B\u00e0i 1:<\/strong>\u00a0T\u00ednh chu vi h\u00ecnh thoi c\u00f3 c\u1ea1nh d\u00e0i 5.6cm.<\/p>\n<p><em>\u0110\u00e1p \u00e1n:<\/em>\u00a0P = 5.6 x 4 = 22.4 cm.<\/p>\n<p><strong>B\u00e0i 2:<\/strong>\u00a0M\u1ed9t m\u1ea3nh v\u01b0\u1eddn h\u00ecnh thoi c\u00f3 chu vi l\u00e0 80m. H\u1ecfi \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a m\u1ea3nh v\u01b0\u1eddn l\u00e0 bao nhi\u00eau?<\/p>\n<p><em>\u0110\u00e1p \u00e1n:<\/em>\u00a0a = 80 \/ 4 = 20 m.<\/p>\n<p><strong>B\u00e0i 3:<\/strong>\u00a0M\u1ed9t t\u1ea5m k\u00ednh h\u00ecnh thoi c\u00f3 \u0111\u1ed9 d\u00e0i hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 12cm v\u00e0 16cm. T\u00ednh chu vi c\u1ee7a t\u1ea5m k\u00ednh \u0111\u00f3.<\/p>\n<p><em>\u0110\u00e1p \u00e1n:<\/em>\u00a0\u0110\u1ed9 d\u00e0i c\u1ea1nh a = \u221a[(12\/2)\u00b2 + (16\/2)\u00b2] = \u221a(6\u00b2 + 8\u00b2) = \u221a(36 + 64) = \u221a100 = 10 cm. Chu vi t\u1ea5m k\u00ednh l\u00e0 P = 10 x 4 = 40 cm.<\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-8.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-8-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-8-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-301346 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-8.jpg\" alt=\"chu-vi-hinh-thoi-8\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-8-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-8-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp \u1ee9ng d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">B\u00ean c\u1ea1nh b\u00e0i t\u1eadp t\u00ednh chu vi h\u00ecnh thoi, b\u1ea1n c\u1ea7n t\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp gi\u00fap b\u1ea1n hi\u1ec3u h\u01a1n v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i 1<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Cho 1 khu \u0111\u1ea5t c\u00f3 h\u00ecnh thoi v\u00e0 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a khu \u0111\u1ea5t c\u00f3 t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1eb1ng 400cm. Trong \u0111\u00f3 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ea7u ti\u00ean s\u1ebd b\u1eb1ng 3\/5 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o th\u1ee9 2. H\u00e3y t\u00ednh S c\u1ee7a khu \u0111\u1ea5t n\u00e0y?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1ed1 ph\u1ea7n \u0111\u01b0\u1ee3c ph\u00e2n ra t\u1eeb hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a khu \u0111\u1ea5t l\u00e0 3 + 5 = 8 ph\u1ea7n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o 2 = (400\/8) x 5 = 250cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ea7u ti\u00ean = 400 &#8211; 250 = 150cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S c\u1ee7a h\u00ecnh thoi = (250.150)\/2 = 18750 cm2<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i 2<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Cho 1 khu \u0111\u1ea5t d\u1ea1ng h\u00ecnh thoi bao g\u1ed3m chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o 1 b\u1eb1ng 20m, chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o 2 b\u1eb1ng 3\/4\u00a0 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o 1. Ng\u01b0\u1eddi n\u00f4ng d\u00e2n tr\u1ed3ng khoai lang trong khu \u0111\u1ea5t v\u00e0 t\u1eebng m2 n\u00e0y s\u1ebd thu \u0111\u01b0\u1ee3c kho\u1ea3ng 5kg khoai lang. V\u1eady ng\u01b0\u1eddi n\u00f4ng d\u00e2n n\u00e0y thu \u0111\u01b0\u1ee3c m\u1ea5y kg khoai lang?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o 2 = (20\/4) x 3 = 15m<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S c\u1ee7a khu \u0111\u1ea5t c\u00f3 d\u1ea1ng h\u00ecnh thoi = (20 x 15)\/2 = 150 m2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1ed1 kg khoai lang thu \u0111\u01b0\u1ee3c trong khu \u0111\u1ea5t = 150 x 5 = 750kg<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i 3<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Cho 1 h\u00ecnh thoi t\u00ean ABCD v\u1edbi \u0111i\u1ec3m O \u0111\u01b0\u1ee3c coi l\u00e0 giao \u0111i\u1ec3m 2 \u0111\u01b0\u1eddng ch\u00e9o. Cho bi\u1ebft S h\u00ecnh thoi n\u00e0y b\u1eb1ng 60cm2 c\u00f9ng c\u1ea1nh AC b\u1eb1ng 10cm. V\u1eady h\u00e3y t\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh h\u00ecnh thoi n\u00e0y?<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-9.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-9-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/chu-vi-hinh-thoi-9-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-301347 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-9.jpg\" alt=\"chu-vi-hinh-thoi-9\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-9.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-9-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-thoi-9-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S c\u1ee7a h\u00ecnh thoi = 1\/2 x AC\u00a0 x BD<\/span><\/p>\n<p><span style=\"font-weight: 400;\">T\u1eeb \u0111\u00f3 suy ra BD = (2.S) : AC = (2 . 60) : 10 = 12cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D\u1ef1a tr\u00ean t\u00ednh ch\u1ea5t h\u00ecnh thoi th\u00ec ta c\u00f3 O \u0111\u01b0\u1ee3c coi nh\u01b0 trung \u0111i\u1ec3m c\u1ea1nh BD, AC.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Suy ra c\u1ea1nh OA = 1\/2 x AC = 1\/2 x 10 = 5cm\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2192 C\u1ea1nh OB = 1\/2 x BD = 1\/2 x 12 = 6cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ta ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng \u0111\u1ecbnh l\u00fd c\u1ee7a Pitago v\u00e0o trong tam gi\u00e1c t\u00ean AOB v\u00e0 \u0111\u01b0\u1ee3c:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">AB^2 = OA^2 + OB^2 = 5^2 + 6^2 = 61 \u2192 C\u1ea1nh AB b\u1eb1ng 7.81cm (chi\u1ec1u d\u00e0i c\u00e1c c\u1ea1nh c\u1ee7a h\u00ecnh thoi t\u00ean ABCD \u1edf tr\u00ean)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nh\u01b0 v\u1eady b\u00e0i vi\u1ebft \u0111\u00e3 cung c\u1ea5p ki\u1ebfn th\u1ee9c v\u1ec1 chu vi h\u00ecnh thoi v\u00e0 di\u1ec7n t\u00edch h\u00ecnh thoi cho m\u1ecdi ng\u01b0\u1eddi t\u00ecm hi\u1ec3u. \u0110\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c b\u1ea1n h\u1ecdc sinh ph\u1ea3i n\u1eafm ch\u1eafc c\u00f4ng th\u1ee9c n\u00e0y v\u00e0 gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp li\u00ean quan th\u01b0\u1eddng xuy\u00ean \u0111\u1ec3 l\u00e0m c\u00e1c b\u00e0i thi t\u1ed1t h\u01a1n. Hi\u1ec7n nay c\u00e1c d\u1ea1ng to\u00e1n h\u00ecnh h\u1ecdc \u0111\u1ec1u c\u00f3 \u0111\u1ec1 c\u1eadp t\u1edbi h\u00ecnh thoi v\u00e0 c\u00e1c c\u00f4ng th\u1ee9c c\u1ee7a n\u00f3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tham kh\u1ea3o b\u00e0i vi\u1ebft li\u00ean quan:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-chu-nhat\/\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt d\u1ec5 hi\u1ec3u, ch\u00ednh x\u00e1c nh\u1ea5t 2023<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/duong-cheo-hinh-vuong\/\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c t\u00ednh \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh vu\u00f4ng, \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Chu vi h\u00ecnh thoi l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c To\u00e1n h\u1ecdc c\u01a1 b\u1ea3n v\u00e0 quan tr\u1ecdng, xu\u1ea5t hi\u1ec7n th\u01b0\u1eddng xuy\u00ean trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc ph\u1ed5 th\u00f4ng v\u00e0 c\u00e1c b\u00e0i to\u00e1n th\u1ef1c t\u1ebf. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i ai c\u0169ng n\u1eafm v\u1eefng t\u1ea5t c\u1ea3 c\u00e1c c\u00f4ng th\u1ee9c v\u00e0 d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan. Trong b\u00e0i vi\u1ebft [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":301338,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-301326","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>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi &amp; C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i<\/title>\n<meta name=\"description\" content=\"N\u1eafm v\u1eefng c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao. 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