H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song<\/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\/hinh-hoc-chuong-2-bai-3-duong-tha\u0309ng-va-ma\u0323t-pha\u0309ng-song-song\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 63 SGK H\u00ecnh h\u1ecdc 11):\u00a0Cho hai h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF kh\u00f4ng c\u00f9ng n\u1eb1m trong m\u1ed9t m\u1eb7t ph\u1eb3ng. a) G\u1ecdi O v\u00e0 O\u2019 l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF. Ch\u1ee9ng minh r\u1eb1ng \u0111\u01b0\u1eddng th\u1eb3ng OO\u2019 song song v\u00e0 c\u00e1c m\u1eb7t ph\u1eb3ng (ADF) v\u00e0 (BCF) b) […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha\u0309ng-va-ma\u0323t-pha\u0309ng-song-song\/\" \/>\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=\"2018-05-13T08:00:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-05-13T07:56:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/05\/bai-1-trang-63-sgk-hinh-hoc-11.png\" \/>\n\t<meta property=\"og:image:width\" content=\"267\" \/>\n\t<meta property=\"og:image:height\" content=\"205\" \/>\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\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/\",\"url\":\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/\",\"name\":\"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-05-13T08:00:58+00:00\",\"dateModified\":\"2018-05-13T07:56:54+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"H\u00ecnh h\u1ecdc – Ch\u01b0\u01a1ng 2 – B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song\"}]},{\"@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_head_json":{"title":"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song","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\/hinh-hoc-chuong-2-bai-3-duong-tha\u0309ng-va-ma\u0323t-pha\u0309ng-song-song\/","og_locale":"en_US","og_type":"article","og_title":"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song","og_description":"B\u00e0i 1 (trang 63 SGK H\u00ecnh h\u1ecdc 11):\u00a0Cho hai h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF kh\u00f4ng c\u00f9ng n\u1eb1m trong m\u1ed9t m\u1eb7t ph\u1eb3ng. a) G\u1ecdi O v\u00e0 O\u2019 l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF. 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{"id":30126,"date":"2018-05-13T15:00:58","date_gmt":"2018-05-13T08:00:58","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=30126"},"modified":"2018-05-13T14:56:54","modified_gmt":"2018-05-13T07:56:54","slug":"hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-2-bai-3-duong-tha%cc%89ng-va-ma%cc%a3t-pha%cc%89ng-song-song\/","title":{"rendered":"H\u00ecnh h\u1ecdc – Ch\u01b0\u01a1ng 2 – B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song"},"content":{"rendered":"

B\u00e0i 1 (trang 63 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho hai h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF kh\u00f4ng c\u00f9ng n\u1eb1m trong m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n

a) G\u1ecdi O v\u00e0 O\u2019 l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF. Ch\u1ee9ng minh r\u1eb1ng \u0111\u01b0\u1eddng th\u1eb3ng OO\u2019 song song v\u00e0 c\u00e1c m\u1eb7t ph\u1eb3ng (ADF) v\u00e0 (BCF)<\/p>\n

b) G\u1ecdi M v\u00e0 N l\u1ea7n l\u01b0\u1ee3t l\u00e0 tr\u1ecdng t\u00e2m c\u1ee7a tam gi\u00e1c ABD v\u00e0 ABE. Ch\u1ee9ng minh \u0111\u01b0\u1eddng th\u1eb3ng MN song song v\u1edbi m\u1eb7t ph\u1eb3ng (CEF).<\/p>\n

$\"\"$ <\/p>\n

L\u1eddi gi\u1ea3i<\/strong><\/p>\n

a) BFD c\u00f3 OO\u2019 l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh n\u00ean OO\u2019 \/\/ DF m\u00e0 DF (ADF) n\u00ean OO” \/\/ (ADF)<\/p>\n

\u0394AEC c\u00f3 OO\u2019 l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh n\u00ean OO\u2019 \/\/ EC m\u00e0 EC (BCE) n\u00ean OO\u2019 \/\/ (BCE).<\/p>\n

b) Ta th\u1ea5y mp(CEF) ch\u00ednh l\u00e0 mp(CEFD). G\u1ecdi I l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB:<\/p>\n

\u0394ABD c\u00f3 hai trung tuy\u1ebfn AO, DI c\u1eaft nhau t\u1ea1i tr\u1ecdng t\u00e2m M<\/p>\n

\u0394ABE c\u00f3 hai trung tuy\u1ebfn BO\u2019, EI c\u1eaft nhau t\u1ea1i tr\u1ecdng t\u00e2m N<\/p>\n

Trong \u0394IDE, ta c\u00f3 IM\/ID = IN\/IE = 1\/3 => MN \/\/ DE m\u00e0 ED \u2282 (CEFD)<\/p>\n

n\u00ean MN \/\/ (CEFD) hay MN \/\/ (CEF).<\/p>\n

B\u00e0i 2 (trang 63 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho t\u1ee9 di\u1ec7n ABCD. Tr\u00ean c\u1ea1nh AB l\u1ea5y m\u1ed9t \u0111i\u1ec3m M. Cho (\u03b1) l\u00e0 m\u1eb7t ph\u1eb3ng qua M, song song v\u1edbi hai \u0111\u01b0\u1eddng th\u1eb3ng AC v\u00e0 BD.<\/p>\n

a) T\u00ecm giao tuy\u1ebfn c\u1ee7a (\u03b1) v\u1edbi c\u00e1c m\u1eb7t c\u1ee7a t\u1ee9 di\u1ec7n.<\/p>\n

b) Thi\u1ebft di\u1ec7n c\u1ee7a t\u1ee9 di\u1ec7n c\u1eaft b\u1edfi m\u1eb7t ph\u1eb3ng (\u03b1) l\u00e0 h\u00ecnh g\u00ec?<\/p>\n

$\"\"$ <\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

a) Giao tuy\u1ebfn c\u1ee7a (\u03b1) v\u1edbi c\u00e1c m\u1eb7t c\u1ee7a t\u1ee9 di\u1ec7n l\u00e0 c\u00e1c c\u1ea1nh c\u1ee7a t\u1ee9 gi\u00e1c c\u00f3:<\/p>\n

MN\/\/ PQ\/\/ AC v\u00e0 MQ\/\/ NP\/\/ BD.<\/p>\n

b) Thi\u1ebft di\u1ec7n t\u1ea1o b\u1edfi m\u1eb7t ph\u1eb3ng (\u03b1) v\u1edbi t\u1ee9 di\u1ec7n l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh.<\/p>\n

B\u00e0i 3 (trang 63 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho h\u00ecnh ch\u00f3p S.ABCD c\u00f3 \u0111\u00e1y ABCD l\u00e0 m\u1ed9t t\u1ee9 gi\u00e1c l\u1ed3i. G\u1ecdi O l\u00e0 giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o AC v\u00e0 BD . X\u00e1c \u0111\u1ecbnh thi\u1ebft di\u1ec7n c\u1ee7a h\u00ecnh chop c\u1eaft b\u1edfi m\u1eb7t ph\u1eb3ng (\u03b1) \u0111i qua O, song song v\u00f3i AB v\u00e0 SC. Thi\u1ebft di\u1ec7n \u0111\u00f3 l\u00e0 h\u00ecnh g\u00ec?<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

$\"\"$ <\/p>\n

$\"\"$ <\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 63 SGK H\u00ecnh h\u1ecdc 11):\u00a0Cho hai h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF kh\u00f4ng c\u00f9ng n\u1eb1m trong m\u1ed9t m\u1eb7t ph\u1eb3ng. a) G\u1ecdi O v\u00e0 O\u2019 l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF. Ch\u1ee9ng minh r\u1eb1ng \u0111\u01b0\u1eddng th\u1eb3ng OO\u2019 song song v\u00e0 c\u00e1c m\u1eb7t ph\u1eb3ng (ADF) v\u00e0 (BCF) b) […]<\/p>\n","protected":false},"author":3,"featured_media":29435,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1318],"tags":[1464,1463],"yoast_head":"\nH\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song<\/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\/hinh-hoc-chuong-2-bai-3-duong-tha\u0309ng-va-ma\u0323t-pha\u0309ng-song-song\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 2 - B\u00e0i 3: \u0110\u01b0\u01a1\u0300ng th\u0103\u0309ng va\u0300 m\u0103\u0323t ph\u0103\u0309ng song song\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 63 SGK H\u00ecnh h\u1ecdc 11):\u00a0Cho hai h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF kh\u00f4ng c\u00f9ng n\u1eb1m trong m\u1ed9t m\u1eb7t ph\u1eb3ng. a) G\u1ecdi O v\u00e0 O\u2019 l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u00e2m c\u1ee7a c\u00e1c h\u00ecnh b\u00ecnh h\u00e0nh ABCD v\u00e0 ABEF. 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