1. Th\u1ec3 t\u00edch h\u00ecnh l\u0103ng tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh (5)<\/p>\n
\n
2. Th\u1ec3 t\u00edch h\u00ecnh n\u00f3n c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh\/3 (6)<\/p>\n
3. Cho h\u00ecnh ch\u00f3p S.ABC. G\u1ecdi A’, B’, C’ l\u1ea7n l\u01b0\u1ee3t l\u00e0 c\u00e1c \u0111i\u1ec3m tr\u00ean c\u1ea1nh SA, SB. SC . G\u1ecdi V l\u00e0 th\u1ec3 t\u00edch S.ABC, V’ l\u00e0 th\u1ec3 t\u00edch S.A’B’C’. Khi \u0111\u00f3<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien.png\")
<\/p>\n
Ch\u00fa \u00fd: C\u00f4ng th\u1ee9c tr\u00ean ch\u1ec9 \u0111\u00fang \u0111\u1ed1i v\u1edbi c\u00e1c h\u00ecnh ch\u00f3p tam gi\u00e1c<\/p>\n
4. Cho AB, CD l\u00e0 hai \u0111o\u1ea1n th\u1eb3ng ch\u00e9o nhau, g\u00f3c gi\u1eefa ch\u00fang b\u1eb1ng \u03b1, kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng AB v\u00e0 CD b\u1eb1ng h . Khi \u0111\u00f3<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien-1.png\")
<\/p>\n
5. Nh\u1eadn x\u00e9t. C\u00e1c b\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m c\u1ee7a m\u1ee5c n\u00e0y th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi ph\u1ea3i t\u00ednh th\u1eadt nhanh th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n. Mu\u1ed1n v\u1eady ta ph\u1ea3i t\u00ednh nh\u00e2nh \u0111\u1ed9 d\u00e0i \u0111o\u1ea1n th\u1eb3ng , di\u1ec7n t\u00edch \u0111a gi\u00e1c c\u1ea7n t\u00ecm. Do \u0111\u00f3 ta nh\u1edb \u0111\u01b0\u1ee3c c\u00e0ng nhi\u1ec1u c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n c\u00e0ng t\u1ed1t. Sau \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n nh\u01b0ng hay d\u00f9ng trong lo\u1ea1i b\u00e0i t\u1eadp n\u00e0y.<\/p>\n
a) Cho tam gi\u00e1c \u0111\u1ec1u ABC, c\u1ea1nh a, M l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC, I l\u00e0 t\u00e2m c\u1ee7a tam gi\u00e1c th\u00ec ta lu\u00f4n c\u00f3:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien-2.png\")
<\/p>\n
b) Tam gi\u00e1c ABC vu\u00f4ng c\u00e2n \u1edf A, AB = a , M l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC. Khi \u0111\u00f3:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien-3.png\")
<\/p>\n
c) Tam gi\u00e1c ABC vu\u00f4ng \u1edf A, H l\u00e0 h\u00ecnh chi\u1ebfu c\u1ee7a A l\u00ean BC, g\u00f3c ABC = \u03b1 . Khi \u0111\u00f3<\/p>\n
CA = ABtan\u03b1 = BCsin\u03b1;<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien-4.png\")
<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
1. Th\u1ec3 t\u00edch h\u00ecnh l\u0103ng tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh (5) 2. Th\u1ec3 t\u00edch h\u00ecnh n\u00f3n c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh\/3 (6) 3. Cho h\u00ecnh ch\u00f3p S.ABC. G\u1ecdi A’, B’, C’ l\u1ea7n l\u01b0\u1ee3t l\u00e0 c\u00e1c \u0111i\u1ec3m tr\u00ean c\u1ea1nh […]<\/p>\n","protected":false},"author":3,"featured_media":28944,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1450,1448],"yoast_head":"\n
B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 - B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n - L\u00fd thuy\u1ebft<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 - B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n - L\u00fd thuy\u1ebft\" \/>\n<meta property=\"og:description\" content=\"1. Th\u1ec3 t\u00edch h\u00ecnh l\u0103ng tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh (5) 2. Th\u1ec3 t\u00edch h\u00ecnh n\u00f3n c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh\/3 (6) 3. Cho h\u00ecnh ch\u00f3p S.ABC. G\u1ecdi A’, B’, C’ l\u1ea7n l\u01b0\u1ee3t l\u00e0 c\u00e1c \u0111i\u1ec3m tr\u00ean c\u1ea1nh […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-04-27T10:23:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/ly-thuyet-the-tich-khoi-da-dien.png\" \/>\n\t<meta property=\"og:image:width\" content=\"159\" \/>\n\t<meta property=\"og:image:height\" content=\"54\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/\",\"url\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/\",\"name\":\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 - B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n - L\u00fd thuy\u1ebft\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-27T10:23:11+00:00\",\"dateModified\":\"2018-04-27T10:23:11+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 – B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n – L\u00fd thuy\u1ebft\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 - B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n - L\u00fd thuy\u1ebft","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-hinh-hoc-12-chuong-1-bai-3-the-tich-khoi-da-dien-ly-thuyet\/","og_locale":"en_US","og_type":"article","og_title":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m H\u00ecnh h\u1ecdc 12 \u2013 Ch\u01b0\u01a1ng 1 - B\u00e0i 3: Th\u1ec3 t\u00edch kh\u1ed1i \u0111a di\u1ec7n - L\u00fd thuy\u1ebft","og_description":"1. Th\u1ec3 t\u00edch h\u00ecnh l\u0103ng tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh (5) 2. Th\u1ec3 t\u00edch h\u00ecnh n\u00f3n c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y l\u00e0 B, chi\u1ec1u cao h l\u00e0 V = Bh\/3 (6) 3. Cho h\u00ecnh ch\u00f3p S.ABC. 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