H\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 t\u1ee9 gi\u00e1c m\u00e0 c\u00f3 hai c\u1eb7p song song c\u1ea1nh \u0111\u1ed1i song song v\u1edbi nhau ho\u1eb7c b\u1eb1ng nhau. Trong h\u00ecnh b\u00ecnh h\u00e0nh s\u1ebd c\u00f3 hai g\u00f3c \u0111\u1ed1i b\u1eb1ng nhua, 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a h\u00ecnh \u0111\u00f3. \u0110\u1ec3 gi\u00fap d\u1ec5 nh\u1edb h\u01a1n th\u00ec c\u00e1c b\u1ea1n h\u00e3y nh\u1edb h\u00ecnh b\u00ecnh h\u00e0n l\u00e0 \u0111\u01b0\u1eddng tr\u01b0\u1eddng h\u1edbp \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh thang.<\/p>\n C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh nh\u01b0 sau:<\/strong><\/p>\n Kh\u00e1i ni\u1ec7m: Di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh s\u1ebd b\u1eb1ng t\u00edch c\u1ee7a c\u1ea1nh \u0111\u00e1y nh\u00e2n v\u1edbi chi\u1ec1u cao.<\/p>\n C\u00f4ng th\u1ee9c t\u00ednh:<\/p>\n S=AxH<\/p>\n Trong \u0111\u00f3:<\/p>\n A: ch\u00ednh l\u00e0 l\u00e0 c\u1ea1nh \u0111\u00e1y c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nhh<\/p>\n H: L\u00e0 chi\u1ec1u cao n\u1ed1i t\u1eeb \u0111\u1ec9nh t\u1edbi \u0111\u00e1y c\u1ee7a h\u00ecnh<\/p>\n V\u00ed d\u1ee5 minh h\u1ecda:<\/p>\n C\u00f3 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 chi\u1ec1u d\u00e0i c\u1ea1nh \u0111\u00e1y b\u1eb1ng 8 m v\u00e0 chi\u1ec1u cao n\u1ed1i t\u1eeb \u0111\u1ec9nh a xu\u1ed1ng c\u1ea1nh CD l\u00e0 5 m. H\u00e3y t\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh.<\/p>\n Theo c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh \u1edf tr\u00ean th\u00ec ta s\u1ebd \u00e1p d\u1ee5ng \u0111\u1ec3 gi\u1ea3i v\u00ed d\u1ee5 n\u00e0y nh\u01b0 sau:<\/p>\n Chi\u1ec1u d\u00e0i c\u1ea1nh \u0111\u00e1y CD ch\u00ednh l\u00e0 a b\u1eb1ng 8m v\u00e0 chi\u1ec1u cao n\u1ed1i t\u1eeb \u0111\u1ec9nh xu\u1ed1ng c\u1ea1nh \u0111\u00e1y b\u1eb1ng 5m. \u00c1p d\u1ee5ng v\u00e0o c\u00f4ng th\u1ee9c ta c\u00f3:<\/p>\n S(ABCD)= a x h= 8 x 5= 40 m2<\/sup><\/p>\n V\u00ed d\u1ee5 tr\u00ean tr\u00ean ch\u1ec9 mang t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n v\u00e0 r\u1ea5t d\u1ec5 \u00e1p d\u1ee5ng \u0111\u1ec3 gi\u00e1i. Tuy nhi\u00ean \u0111\u1ed1i v\u1edbi nh\u1eefng b\u00e0i to\u00e1n ph\u1ee9c t\u1ea1p h\u01a1n th\u00ec ch\u00fang ta c\u00e2ng v\u1eadn d\u1ee5ng th\u00eam m\u1ed1i t\u01b0\u01a1ng quan gi\u1eef c\u00e1c th\u00e0nh ph\u1ea7n trong m\u1ed9t\u00a0 c\u00f4ng th\u1ee9c v\u00e0 k\u1ebft h\u1ee3p nhi\u1ec1u c\u00f4ng th\u1ee9c kh\u00e1c nhau \u0111\u1ec3 gi\u1ea3i quy\u1ebft.<\/p>\n B\u00e0i t\u1eadp 1: Cho h\u00ecnh b\u00ecnh h\u00e0nh ABCD c\u00f3 chi\u1ec1u cao h\u1ea1 xu\u1ed1ng c\u1ea1nh l\u00e0 5 cm, chi\u1ec1u d\u00e0i l\u00e0 15cm. H\u00e3y t\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3<\/p>\n S(ABCD) = 5 x 15 =\u00a0 75 cm2<\/sup><\/p>\n B\u00e0i t\u1eadp 2:<\/p>\n Cho h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 chu vi l\u00e0 480cm, c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y g\u1ea5p 5 l\u1ea7n c\u1ea1nh \u0111\u00e1y kia v\u00e0 g\u1ea5p 8 l\u1ea7n chi\u1ec1u cao. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh<\/p>\n B\u00e0i gi\u1ea3i:<\/p>\n – Ta c\u00f3 n\u1eeda chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 480 : 2 = 240 (cm)<\/p>\n – N\u1ebfu nh\u01b0 coi c\u1ea1nh kia l\u00e0 1 ph\u1ea7n th\u00ec c\u1ea1nh \u0111\u00e1y ch\u00ednh l\u00e0 5 ph\u1ea7n nh\u01b0 v\u1eady.<\/p>\n Ta c\u00f3 c\u1ea1nh \u0111\u00e1y h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 240 : (5+1) x 5 = 200 (cm)<\/p>\n T\u00ednh \u0111\u01b0\u1ee3c chi\u1ec1u cao c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 200 : 8 = 25 (cm)<\/p>\n Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 200 x 25 = 5000 (cm2)<\/p>\n B\u00e0i t\u1eadp 3:<\/p>\n M\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y l\u00e0 47m, m\u1edf r\u1ed9ng m\u1ea3nh \u0111\u1ea5t b\u1eb1ng c\u00e1ch t\u0103ng c\u00e1c c\u1ea1nh \u0111\u00e1y c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh n\u00e0y th\u00eam 7m th\u00ec \u0111\u01b0\u1ee3c m\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh m\u1edbi c\u00f3 di\u1ec7n t\u00edch h\u01a1n di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t ban \u0111\u1ea7u l\u00e0 189m2<\/sup>. h\u00e3y t\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t ban \u0111\u1ea7u.<\/p>\n B\u00e0i gi\u1ea3i:<\/p>\n Ph\u1ea7n di\u1ec7n t\u00edch t\u0103ng th\u00eam ch\u00ednh l\u00e0 di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y 7m v\u00e0 chi\u1ec1u cao l\u00e0 chi\u1ec1u cao c\u1ee7a m\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh ban \u0111\u1ea7u.<\/p>\n Chi\u1ec1u cao m\u1ea3nh \u0111\u1ea5t l\u00e0: 189 : 7 = 27 (m)<\/p>\n Di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh ban \u0111\u1ea7u l\u00e0: 27 x 47 = 1269 (m2<\/sup>)<\/p>\n B\u00e0i t\u1eadp 4:<\/p>\n Cho h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 chu vi l\u00e0 364cm v\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y g\u1ea5p 6 l\u1ea7n c\u1ea1nh kia; g\u1ea5p 2 l\u1ea7n chi\u1ec1u cao. H\u00e3y t\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3<\/p>\n B\u00e0i gi\u1ea3i:<\/p>\n N\u1eeda chu vi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 364 : 2 = 182 (cm)<\/p>\n C\u1ea1nh \u0111\u00e1y g\u1ea5p 6 l\u1ea7n c\u1ea1nh kia n\u00ean n\u1eeda chu vi s\u1ebd g\u1ea5p 7 l\u1ea7n c\u1ea1nh kia.<\/p>\n C\u1ea1nh \u0111\u00e1y h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 182 : 7 x 6 = 156 (cm)<\/p>\n Chi\u1ec1u cao h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 156 : 2 = 78 (cm)<\/p>\n Di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 156 x 78 = 12168 (cm2<\/sup>)<\/p>\n B\u00e0i t\u1eadp 5:<\/p>\n M\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y l\u00e0 71cm. Ng\u01b0\u1eddi ta thu h\u1eb9p h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3 b\u1eb1ng c\u00e1ch gi\u1ea3m c\u00e1c c\u1ea1nh \u0111\u00e1y c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111i 19 cm \u0111\u01b0\u1ee3c h\u00ecnh b\u00ecnh h\u00e0nh m\u1edbi c\u00f3 di\u1ec7n t\u00edch nh\u1ecf h\u01a1n di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh ban \u0111\u1ea7u l\u00e0 665cm2. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh ban \u0111\u1ea7u.<\/p>\n B\u00e0i gi\u1ea3i:<\/p>\n Ph\u1ea7n di\u1ec7n t\u00edch gi\u1ea3m \u0111i ch\u00ednh l\u00e0 di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u1ea1nh \u0111\u00e1y l\u00e0 19m v\u00e0 chi\u1ec1u cao l\u00e0 chi\u1ec1u cao m\u1ea3nh \u0111\u1ea5t h\u00ecnh b\u00ecnh h\u00e0nh ban \u0111\u1ea7u.<\/p>\n Chi\u1ec1u cao h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0: 665 : 19 = 35 (cm)<\/p>\n Di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3 l\u00e0:<\/p>\n 71 x 35 = 2485 (cm2<\/sup>)<\/p>\n Trong to\u00e1n h\u1ecdc m\u1ed7i lo\u1ea1i h\u00ecnh s\u1ebd c\u00f3 m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m nh\u1eadn d\u1ea1ng v\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc ri\u00eang bi\u1ec7t.. Nh\u01b0 h\u00ecnh tam gi\u00e1c s\u1ebd c\u00f3 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch, chu vi kh\u00e1c v\u1edbi h\u00ecnh t\u00f2n, h\u00ecnh ch\u00f3p… C\u0169ng gi\u1ed1ng nh\u01b0 v\u1eady th\u00ec c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00ednh h\u00ecnh b\u00ecnh h\u00ecnh c\u0169ng v\u1eady. V\u1edbi b\u00e0i vi\u1ebft v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00ednh h\u00ecnh b\u00ecnh h\u00e0nh v\u00e0 b\u00e0i t\u1eadp \u1edf tr\u00ean, ch\u00fang t\u00f4i hy v\u1ecdng c\u00e1c em s\u1ebd n\u1eafm b\u00e0i t\u1ed1t h\u01a1n v\u00e0 l\u00e0m b\u00e0i t\u1eadp t\u1ed1t \u0111\u1ec3 c\u00f3 k\u1ebft qu\u1ea3 cao trong h\u1ecdc t\u1eadp.<\/p>\n","protected":false},"excerpt":{"rendered":" Trong to\u00e1n h\u1ecdc m\u1ed7i lo\u1ea1i h\u00ecnh s\u1ebd c\u00f3 m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m nh\u1eadn d\u1ea1ng v\u00e0 m\u1ed9t c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc ri\u00eang bi\u1ec7t.. Nh\u01b0 h\u00ecnh tam gi\u00e1c s\u1ebd c\u00f3 c\u00e1ch t\u00ednh di\u1ec7n… <\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/9998"}],"collection":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/comments?post=9998"}],"version-history":[{"count":0,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/9998\/revisions"}],"wp:attachment":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media?parent=9998"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/categories?post=9998"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/tags?post=9998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"http:\/\/www.tamcaotrithuc.com\/wp-content\/uploads\/2017\/11\/cong-thuc-tinh-dien-tich-hinh-binh-hanh-va-bai-tap-ap-dung.jpg\")
B\u00e0i t\u1eadp \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00ednh h\u00ecnh b\u00ecnh h\u00e0nh<\/strong><\/h3>\n