Đề kiểm tra chương 1 môn Hình học lớp 9 (đề số 3)

<span class='text_page_counter'>(1)</span>Đề số 3 : Kiểm tra chương I (Tiết 19 PP) M«n: H×nh häc líp 9. Hä vµ tªn: ………….. Líp:….... §iÓm. Lêi nhËn xÐt cña gi¸o viªn. PhÇn I: Tr¾c nghiÖm Khoanh tròn chữ cái đúng trước kết quả đúng: Câu 1 (0,5đ): Cho hình bên, đẳng thức nào sau đây đúng: BK A. sin C = BA AK C. sin C = AB. AK B. sin C = KC AK D.sin C = BC. B K. A Câu 2 (0,5đ): Sắp xếp nào sau đây đúng: A. sin300 < cos 500 < cos 550 B. cos 500 < sin 300 < cos 550 C. cos 500 < cos 550 < sin 300 D. sin 300 < cos 550 < cos 500 Câu 3 (2,5đ): Cho hai góc nhọn  và  , câu nào đúng, câu nào sai trong các khẳng định sau: C©u Các khẳng định §óng Sai 0 A. cos  = sin(90 -  )  >  th× tg  > tg  B. C. tg  < cotg   >  th× cotg  < cotg  D. E. sin2  + cos2  =1 Câu 4 (0,5đ): Cho hình bên, câu nào sau đây không đúng: B H AB CB  A. B. AC2 = AH . HC C.. BH. AB2. BA. = BH.BC. C. D. AC2 = CH . CB A. PhÇn II: Tù luËn(6 ®iÓm) C©u 5 (3 ®):Dùng gãc nhän  , biÕt r»ng tg  =. 5 3. C©u 6 (3 ®):Gi¶i tam gi¸c vu«ng ABC, biÕt r»ng ¢ = 900, AB = 5, BC = 7 (kÕt qu¶ vÒ góc làm tròn đến phút, về cạnh làm tròn đén chữ thập phân thứ 3 Bµi lµm phÇn tù luËn .................................................................................................................................................................................................. .................................................................................................................................................................................................. .................................................................................................................................................................................................. .................................................................................................................................................................................................. .................................................................................................................................................................................................. .................................................................................................................................................................................................. Lop7.net. C.

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Lop7.net.

<span class='text_page_counter'>(3)</span> đáp án I, Tr¾c nghiÖm(4®) C©u 1: Chän A C©u 2: Chän D. 0,5 ® 0,5 ®. C©u A: §óng C©u B: §óng C©u 3: C©u C: Sai C©u D: §óng C©u E: §óng C©u 4: Chän B. 0,5 ® 0,5 ® 0,5 ® 0,5 ® 0,5 ® 0,5 ®. II. Tù luËn (6 ®) C©u 5 (3®): C¸ch dùng: - Dông gãc vu«ng xOy - Trªn tia Ox lÊy ®iÓm A sao cho OA = 3 cm - Trªn tia Oy lÊy ®iÓm B sao cho OB = 5cm - Nèi A víi B ta ®­îc gãc BAO =  lµ gãc cÇn dùng. 0,25® 0,25® 0,25® 0,25®. A. x 1®. 3 O. B y 5 Chøng minh: Theo c¸ch dùng ta cã:  ABO cã  O = 900, OA = 3cm, OB = 5 cm tg A =. 0,5®. OB 5 = OA 3. C©u 6(3®): Vẽ hình đúng, viết được GT,KL. 0,5®. 5 A Tính đúng AB 5   0,714  Sin 45035' BC 7  C = 450350  vµ B = 900 - 45035' = 44025’ AC = BC sin B = 7. Sin 44025’  4,899. Sin C =. ^. 1®. B 7. C 0,5® 0,5® 0,5® 0,5®. ^. Lop7.net.

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