2019年中考数学专题复习小训练专题21圆的有关计算.doc

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1、1专题 21 圆的有关计算 12017攀枝花如图 Z211, ABC内接于 O, A60, BC6 ,则 的长3 BC 为( ) 图 Z211A2 B4 C8 D1222017天门一个扇形的弧长是 10 cm,面积是 60 cm2,则此扇形的圆心角的度数是( )A300 B150 C120 D7532017 南充如图 Z212,在 Rt ABC中, AC5 cm, BC12 cm, ACB90,把 Rt ABC绕 BC所在直线旋转一周得到一个几何体,则这个几何体的侧面积为( ) 图 Z212A60 cm 2 B65 cm 2C120 cm 2 D130 cm 242017宿迁若将半径为 12

2、cm的半圆形纸片围成一个圆锥的侧面,则这个圆锥的底面圆半径是( )A2 cm B3 cm C4 cm D6 cm52018荆州如图 Z213,扇形 OAB中, AOB100, OA12, C是 OB的中点,CD OB交 于点 D,以 OC为半径的 交 OA于AB CE 2点 E,则图中阴影部分的面积是( ) 图 Z213A1218 3B1236 3C618 3D636 362018广东如图 Z214,矩形 ABCD中, BC4, CD2,以 AD为直径的半圆 O与BC相切于点 E,连接 BD,则阴影部分的面积为_(结果保留 )图 Z21472018盐城如图 Z215是由若干个相同的图形(图)组成的美丽图案的一部分,图中,图形的相关数据:半径 OA2 cm, AOB120,则图的周长为_cm.(结果保留 )图 Z2153详解详析1 B 2. B 3. B 4. D 5. C 6. 7.83

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