配套习题-圆周角 -【青果学院】

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难度系数：

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

提示1：5qC55o2u5ZyG5ZGo6KeS55qE5qaC5b+15ZKM5a6a55CG77yM6YCQ5p2h5YiG5p6Q5Yik5pat
答案：QQ==
6Kej77ya4pGg5Lit77yM6K+l6KeS6L+Y5b+F6aG75Lik6L656YO95ZKM5ZyG55u45Lqk77yM5omN6KGM77yO6ZSZ6K+v77ybPGJyPuKRoeS4re+8jOW/hemhu+aYr+WQjOW8p+aIluetieW8p+aJgOWvue+8jOmUmeivr++8mzxicj7ikaLmraPnoa7vvJs8YnI+4pGj5Lit77yM5b+F6aG75Zyo5ZCM5ZyG5oiW562J5ZyG5Lit77yM6ZSZ6K+v77yOPGJyPuaVhemAiUHvvI4=

本课配套习题挑战模式2/5

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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°

提示1：5qC55o2u6aKY5oSP5o6o5Ye64oigRD02MsKw77yM4oigQkNEPTkwwrDvvIzljbPlj6/mjqjlh7riiKBEQkM9MjjCsO+8jg==
答案：Qw==
6Kej77ya4oi1QkTmmK/iiplP55qE55u05b6E77yMPGJyPuKItOKIoEJDRD05MMKw77yMPGJyPuKIteKIoEE9NjLCsO+8jDxicj7iiLTiiKBEPTYywrDvvIw8YnI+4oi04oigREJDPTI4wrDvvI48YnI+5pWF6YCJQ++8jg==

本课配套习题挑战模式3/5

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3.如图，△ABC内接于⊙O，∠C=45°，AB=2，则⊙O的半径为（）

A: 1

B:

C: 2

D:

提示1：6L+e5o6lQU/vvIzlubblu7bplb/kuqTiiplP5LqO54K5RO+8jOi/nuaOpUJE77yM55Sx5ZyG5ZGo6KeS5a6a55CG5Y+v5b6X4oigROS4juKIoEFCROeahOW6puaVsO+8jOWGjeeUseWLvuiCoeWumueQhuWNs+WPr+ino+etlO+8jg==
答案：RA==
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

本课配套习题挑战模式4/5

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难度系数：

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°

提示1：6L+e5o6lT0PjgIFPQu+8jOagueaNruWchuWRqOinkuWSjOWchuW/g+inkueahOWFs+ezu+ino+etlOWNs+WPr++8jg==
答案：QQ==
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

本课配套习题挑战模式5/5

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难度系数：

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

提示1：55Sx4oigQU9C5LiO4oigQUNC5piv5LyY5bynQULmiYDlr7nnmoTlnIblkajop5LvvIzmoLnmja7lnIblkajop5LlrprnkIbvvIzljbPlj6/msYLlvpfiiKBBQ0I94oigQU9CPTkwwrDvvI4=
答案：Qg==
6Kej562U77ya4oi14oigQU9C5LiO4oigQUNC5piv5LyY5bynQULmiYDlr7nnmoTlnIblkajop5LvvIw8YnI+4oi04oigQU9CPeKIoEFDQu+8jDxicj7iiLXiiKBBT0I9OTDCsO+8jDxicj7iiLTiiKBBQ0I9OTDCsO+8jjxicj7mlYXpgIlC77yO

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