Một số hệ thức giữa cạnh, góc trong tam giác vuông và ứng dụng

Home Lớp 9 Toán lớp 9 - Sách Kết nối tri thức Bài 12. Một số hệ thức giữa cạnh, góc trong tam giác vuông và ứng dụngBài tập cơ bản

{"common":{"save":0,"post_id":"7942","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8374","post_id":"7942","mon_id":"1159278","chapter_id":"1159328","question":"\u0110i\u1ec1n vào ch\u1ed7 ch\u1ea5m: Trong m\u1ed7i tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng ... nhân v\u1edbi sin góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi côsin góc k\u1ec1.<\/p>","options":["A.<\/strong> c\u1ea1nh huy\u1ec1n","B.<\/strong> c\u1ea1nh góc vuông","C.<\/strong> c\u1ea1nh","D.<\/strong> c\u1ea1nh góc vuông còn l\u1ea1i"],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> c\u1ea1nh huy\u1ec1n.<\/span><\/p>Trong m\u1ed7i tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh huy\u1ec1n<\/span> nhân v\u1edbi sin góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi côsin góc k\u1ec1.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-06 01:24:18","option_type":"txt","len":2},{"id":"8375","post_id":"7942","mon_id":"1159278","chapter_id":"1159328","question":"Trong m\u1ed7i tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng …. nhân v\u1edbi tan góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi côtan góc k\u1ec1.<\/p>","options":["A.<\/strong> c\u1ea1nh huy\u1ec1n","B.<\/strong> c\u1ea1nh ","C.<\/strong> c\u1ea1nh kia","D.<\/strong> c\u1ea1nh góc vuông còn l\u1ea1i"],"correct":"4","level":"1","hint":"","answer":"Ch\u1ecdn D.<\/strong> c\u1ea1nh góc vuông còn l\u1ea1i.<\/span><\/p>Trong m\u1ed7i tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh góc vuông còn l\u1ea1i nhân v\u1edbi tan góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi côtan góc k\u1ec1.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-06 01:26:39","option_type":"txt","len":2},{"id":"8377","post_id":"7942","mon_id":"1159278","chapter_id":"1159328","question":"Cho $\\triangle$<\/span>ABC vuông t\u1ea1i A , có BC = a, CA = b, AB = c. Khi \u0111ó<\/p><svg height=\"200\" width=\"170\"> <g><title><\/title><rect fill=\"#ffffaa\" height=\"202\" id=\"canvas_background\" width=\"172\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><path d=\"m21.765,174.15374l0,-163.99999l125.99999,163.99999l-125.99999,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <rect fill=\"#fff\" height=\"20\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"20\" x=\"22\" y=\"154.25\"><\/rect> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"4\" xml:space=\"preserve\" y=\"188.25\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"3\" xml:space=\"preserve\" y=\"18.25\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"152\" xml:space=\"preserve\" y=\"186.25\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"93\" xml:space=\"preserve\" y=\"91.25\">a<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"77\" xml:space=\"preserve\" y=\"195.25\">b<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"0\" xml:space=\"preserve\" y=\"94.25\">c<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> $b=a.\\sin B$<\/span>","B.<\/strong> $b=a.\\sin A$<\/span>","C.<\/strong> $a=b.\\sin B$<\/span>","D.<\/strong> $a=b.\\sin C$<\/span>"],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> $b=a.\\sin B$<\/span>.<\/span><\/p>Trong m\u1ed7i tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh huy\u1ec1n nhân v\u1edbi sin góc \u0111\u1ed1i.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-06 01:29:47","option_type":"math","len":0}]}