配套习题- 圆周角 -【青果学院】

1/5单选题

难度：

1.下列命题中，正确的命题个数是（　　）
①顶点在圆周上的角是圆周角；②圆周角度数等于圆心角度数的一半；
③90°的圆周角所对的弦是直径；④圆周角相等，则它们所对的弧也相等．

A	1个
B	2个
C	3个
D	4个

正确答案：QQ==

6Kej77ya4pGg5Lit77yM6K+l6KeS6L+Y5b+F6aG75Lik6L656YO95ZKM5ZyG55u45Lqk77yM5omN6KGM77yO6ZSZ6K+v77ybPGJyPuKRoeS4re+8jOW/hemhu+aYr+WQjOW8p+aIluetieW8p+aJgOWvue+8jOmUmeivr++8mzxicj7ikaLmraPnoa7vvJs8YnI+4pGj5Lit77yM5b+F6aG75Zyo5ZCM5ZyG5oiW562J5ZyG5Lit77yM6ZSZ6K+v77yOPGJyPuaVhemAiUHvvI4=

2/5单选题

难度：

2.如图，BD是⊙O的直径，∠A=62°，则∠CBD的度数为（）

A	31°
B	30°
C	28°
D	25°

正确答案：Qw==

6Kej77ya4oi1QkTmmK/iiplP55qE55u05b6E77yMPGJyPuKItOKIoEJDRD05MMKw77yMPGJyPuKIteKIoEE9NjLCsO+8jDxicj7iiLTiiKBEPTYywrDvvIw8YnI+4oi04oigREJDPTI4wrDvvI48YnI+5pWF6YCJQ++8jg==

3/5单选题

难度：

3.如图，△ABC内接于⊙O，∠C=45°，AB=2，则⊙O的半径为（）

A	1
B
C	2
D

正确答案：RA==

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

4/5单选题

难度：

4.如图，已知⊙O是正方形ABCD的外接圆，点E是弧AD上任意一点，则∠BEC的度数为（　　）

A	45°
B	30°
C	60°
D	90°

正确答案：QQ==

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

5/5单选题

难度：

5.如图，已知经过原点的⊙P与x、y轴分别交于A、B两点，点C是劣弧OB上一点，则∠ACB=（）

A	80°
B	90°
C	100°
D	无法确定

正确答案：Qg==

6Kej562U77ya4oi14oigQU9C5LiO4oigQUNC5piv5LyY5bynQULmiYDlr7nnmoTlnIblkajop5LvvIw8YnI+4oi04oigQU9CPeKIoEFDQu+8jDxicj7iiLXiiKBBT0I9OTDCsO+8jDxicj7iiLTiiKBBQ0I9OTDCsO+8jjxicj7mlYXpgIlC77yO