De KT 15 phut hinh 9 de 1

<span class='text_page_counter'>(1)</span>Trường THCS Tam Hưng. ĐỀ KIỂM TRA 15 PHÚT. Đề. Lớp ……. Môn:. Họ và tên: …………… …………. 1 Toán 9. Ngày …. tháng … năm ……. Điểm Lời phê của thầy, cô giáo. Đề bài: A. TRẮC NGHIỆM: Chọn đáp án đúng trong các câu sau: Câu 1. Cho tam giác ABC vuông tại A, AH là đường cao. Câu nào trong các câu sau là sai ? A. C.. AB 2 BC.BH. BC. AH = AB. AC. 2 B. AH HB.HC. 1 1 1   D. AH AB AC.  Câu 2. Cho tam giác MPQ vuông tại M có P  . Câu nào sau đây là đúng ?. A.. sin  . MP MQ. sin  . B.. MP PQ. C. Câu 3. Câu nào sau đây là sai ? 0 0 A. sin 10 cos 80 0. D.. sin  . MQ PQ. sin  . PQ MQ. 0 0 B. tan 42 cot 48. 0. 0. 0. C. tan 30 cot 30 D. sin 45 cos 45 Câu 4 : Với góc nhọn  tùy ý. Câu nào sau đây là sai ? sin  tan   2 2 cos  A. sin   cos  1 B. sin  cot  cos  C. tan  .cot  1 D. Câu 5 : Cho Δ ABC vuông tại A đường cao AH khi đó sin BAH bằng : A.. AC AB AH AB. B.. AH BH. AB BC 3 Câu 6 : Cho tam giác ABC vuông tại A, biết cotC = 4 . Giá trị của cosB là :. C.. A.. cos B . D.. 4 5. B.. cos B . 4 3.

<span class='text_page_counter'>(2)</span> cos B . 3 5. cos B . 5 4. C. D. B. TỰ LUẬN Cho tam giác ABC vuông tại A, AB = 6cm, AC = 8cm, đường cao AH a) Tính BC, AH. b) Tính sin HAB. b) Gọi E, F là hình chiếu của H lần lượt lên AB và AC.Chứng minh rằng : AE.AB = AF.AC..

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