如图,四边形ABCD内接于
,
,
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ad80f042-6503-434e-8ad0-f1fa60e477d3.png?resizew=109)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0d1d36ccbf5c6e4513dae86c4228a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3931efe93bc6aa9110a233efb1ae9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7cecd2d5b7eac66bfd39a1d0b555b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ad80f042-6503-434e-8ad0-f1fa60e477d3.png?resizew=109)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-16 23:14:35
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【推荐1】下列有关圆的一些结论:①平分弧的直径垂直于弧所对的弦;②平分弦的直径垂直于弦;③在同圆或等圆中,相等的弦对应的圆周角相等;④同弧或等弧所对的弦相等.其中正确的有( )
A.①③ | B.①④ | C.②④ | D.①②④ |
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【推荐2】如图,△ABC外接于⊙O,∠A=30°,BC=3,则⊙O的半径长为( )
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893435868602368/2895032588165120/STEM/5575133e679041aeb0c197cf498fe624.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893435868602368/2895032588165120/STEM/5575133e679041aeb0c197cf498fe624.png?resizew=171)
A.3 | B.![]() | C.![]() | D.![]() |
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【推荐1】平行四边形的四个顶点在同一圆上,则该平行四边形一定是( )
A.正方形 | B.菱形 | C.矩形 | D.等腰梯形 |
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【推荐2】如图,已知圆周角∠ACB=130°,则圆心角∠AOB=( )
![](https://img.xkw.com/dksih/QBM/2018/1/22/1865946313973760/1866595492364289/STEM/e6acae51875f4eb0a69e436f22436b5a.png?resizew=113)
![](https://img.xkw.com/dksih/QBM/2018/1/22/1865946313973760/1866595492364289/STEM/e6acae51875f4eb0a69e436f22436b5a.png?resizew=113)
A.130° | B.115° | C.100° | D.50° |
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