de kiem tra 1 tiet HKI

<span class='text_page_counter'>(1)</span>Trường THCS xã Hàng Vịnh Hoï vaø teân hoïc sinh: ……………………………………………… Lớp: 6A…… Ñieåm. Kieåm tra: 45 phuùt Moân: Hình hoïc Ngaøy …… thaùng 04 naêm 2012 Lời phê của thầy (cô). ĐỀ BÀI I. Traéc nghieäm (3,0 ñieåm): Hãy khoanh vào chữ cái đứng trước câu trả lời mà em cho là đúng nhất. Câu 1 : Nếu tia Oy nằm giữa hai tia Ox và Oz (Hình1) thì :       A. xOy  yOz xOz B. xOy  yOz xOz    C. xOz  xOy  yOz. y. x.    D. xOz  yOz xOy. O. z. Hình 1.  /  / 0   Câu 2 : Cho xOy và yOx là hai góc kề bù , biết xOy 120 . Số đo yOx bằng : B. 300 B. 600 C. 1800 D. 900 t.  Câu 3: Tia Ot là tia phân giác của xOy (Hình 2) khi :      A. xOt  yOt B. xOt  tOy  xOy.     yOt   xOy   tOy   xOy xOt xOt 2 2 C. D. Câu 4 : Hai góc phụ nhau là hai góc có tổng số đo bằng : A. 1800 B. 1000 C. 600 Câu 5 : Hai góc bù nhau là hai góc có tổng số đo bằng : A. 450 B. 900 C. 1800 Câu 6 : Đoạn thẳng nối hai mút của cung là : A. Đường kính B. Dây cung C. Bán kính II. Tự luận: (7,0 điểm): Caâu 7:. x. y. O. Hình 2 0. D. 90. D. 1000 D. Cung tròn. 0  0  ( 3,0 điểm) Trên cùng một nửa mặt phẳng bờ chứa tia Ox. Vẽ góc xOz = 45 ; xOy = 90. a) Tia Oz có nằm giữa tia Ox và Oy không? Vì sao ?   yOz và so sánh với xOz b) Tính goùc  c) Tia Oz coù laø tia phaân giaùc cuûa goùc xOy khoâng? Vì sao? Caâu 8: ( 3,0 ñieåm) Cho hai tia Oy, Oz cùng nằm trên một nửa mặt phẳng có chứa tia Ox. Biết   xOy 60 0 , xOz 1400 a) Tính số đo góc yOz = ?    b) Vẽ tia phân giác Oa của xOy , tia phân giác Ob của xOz . Tính số đo của aOb ? Bài làm ........................................................................................................................................................................ ........................................................................................................................................................................ ........................................................................................................................................................................ ........................................................................................................................................................................ .........................................................................................................................................................................

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