浙江省2019年中考数学复习第六章圆第二节直线与圆的位置关系课前诊断测试.doc

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1直线与圆的位置关系课前诊断测试1O 的半径为 5,圆心 O 到直线 l 的距离为 3,则直线 l 与O 的位置关系是( ) A相切 B相交C相离 D不能确定2如图,O30,C 为 OB 上一点,且 OC6,以点 C 为圆心,半径为 3 的圆与 OA 的位置关系是( )A相离 B相交C相切 D不能确定3如图,AB 是O 的直径,BD,CD 分别是过O 上点 B,C 的切线,且BDC 110,连结 AC,则A的度数是( )A25 B30C35 D404如图,两个同心圆,大圆的半径为 5,小圆的半径为 3,若大圆的弦 AB 与小圆有公共点,则弦 AB 的取值范围是( )A8AB10 B8AB10C4AB5 D4AB55如图,四边形 ABCD 内接于O,AB 是直径,过 C 点的切线与 AB 的延长线交于 P 点,若P40,则D 的度数为_. 26如图,在平面直角坐标系中,M 与 x 轴相切于点 A(8,0),与 y 轴分别交于点 B(0,4)与点C(0,16),则圆心 M 到坐标原点 O 的距离是_. 7如图,O 是边长为 2 的等边ABC 的内切圆,则O 的半径为_. 8如图所示,线段 AB 过圆心 O,CDB20,过点 C 作O 的切线交 AB 的延长线于点 E,则E 等于_. 参考答案1B 2.C 3.C 4.A5115 6.2 7. 8.504133

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