Bài tập cuối chương 4 - Hệ thức lượng trong tam giác vuông

Home Lớp 9 Toán lớp 9 - Sách Kết nối tri thức Bài tập cuối chương 4 - Hệ thức lượng trong tam giác vuôngBài tập cơ bản

{"common":{"save":0,"post_id":"7867","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7988","post_id":"7867","mon_id":"1159278","chapter_id":"1159328","question":"\u0110i\u1ec1n vào ch\u1ed7 ch\u1ea5m: Trong tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh huy\u1ec1n nhân v\u1edbi sin c\u1ee7a góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi ....<\/p>","options":["A.<\/strong> sin c\u1ee7a góc \u0111\u1ed1i","B.<\/strong> côsin góc k\u1ec1","C.<\/strong> côsin góc \u0111\u1ed1i","D.<\/strong> tan c\u1ee7a góc k\u1ec1"],"correct":"2","level":"1","hint":"","answer":"Ch\u1ecdn B.<\/strong> côsin góc k\u1ec1<\/span><\/p>Trong tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh huy\u1ec1n nhân v\u1edbi sin c\u1ee7a góc \u0111\u1ed1i ho\u1eb7c nhân v\u1edbi côsin góc k\u1ec1<\/strong>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-21 01:44:16","option_type":"txt","len":2},{"id":"7989","post_id":"7867","mon_id":"1159278","chapter_id":"1159328","question":"Cho α và β là hai góc ph\u1ee5 nhau. Ch\u1ecdn \u0111áp án \u0111úng<\/strong>.<\/p>","options":["A.<\/strong> sin α = sin β","B.<\/strong> cos α = cos β","C.<\/strong> cot α = sin β","D.<\/strong> tan α = cot β"],"correct":"4","level":"1","hint":"","answer":"Ch\u1ecdn D.<\/strong> tan α = cot β<\/span><\/p>Vì α và β là hai góc ph\u1ee5 nhau nên sin góc này b\u1eb1ng côsin góc kia, tan góc này b\u1eb1ng côtan góc kia. <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-21 01:47:06","option_type":"txt","len":2},{"id":"7991","post_id":"7867","mon_id":"1159278","chapter_id":"1159328","question":"Ch\u1ecdn \u0111áp án \u0111úng<\/strong>. Cho $\\Delta$<\/span>ABC vuông t\u1ea1i A , ta có:<\/p><svg height=\"130\" width=\"200\"> <g><title><\/title><rect fill=\"#fff\" height=\"132\" id=\"canvas_background\" width=\"202\" 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><g id=\"svg_6\"> <path d=\"m22.67932,108.31464l0,-85l149,85l-149,0z\" fill=\"#aaffff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2.86363\" xml:space=\"preserve\" y=\"121.43181\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"6.86363\" xml:space=\"preserve\" y=\"22.43181\">B<\/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=\"172.86363\" xml:space=\"preserve\" y=\"122.43181\">C<\/text> <rect fill=\"#fff\" height=\"17\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"1.5\" width=\"14\" x=\"22.86363\" y=\"91.43181\"><\/rect> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> $AC = BC .\\cos B$<\/span>","B.<\/strong> $BC = AC .\\cos C$<\/span>","C.<\/strong> $AC = AB .\\cos C$<\/span>","D.<\/strong> $AC = BC .\\cos C$<\/span>"],"correct":"4","level":"1","hint":"","answer":"Ch\u1ecdn D.<\/strong> $AC = BC .\\cos C$<\/span><\/span><\/p>Trong tam giác vuông, m\u1ed7i c\u1ea1nh góc vuông b\u1eb1ng c\u1ea1nh huy\u1ec1n nhân v\u1edbi côsin góc k\u1ec1 nên $AC = BC .\\cos C$<\/span><\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-21 01:50:10","option_type":"math","len":0}]}