如图,已知AC是⊙O的直径,过点C的弦CD平行于半径OB,若∠C的度数是40°,则∠B的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/12/1995ca11-d469-40ca-8f2c-27404b6af2d6.png?resizew=120)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/12/1995ca11-d469-40ca-8f2c-27404b6af2d6.png?resizew=120)
A.15° | B.20° | C.30° | D.40° |
更新时间:2020-06-03 09:01:27
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【推荐1】如图,在△ABC中,AB=AC,FD⊥BC于D,DE⊥AB于E,∠AFD=153°,则∠EDF的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/8/27/2019345984839680/2020000721403904/STEM/e99687796b1c4f62bbbc29f0a2ab226e.png?resizew=77)
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【推荐2】如图,⊙
中,
,
是弦,
在
的内部,
,
,
,则下列关系式中,正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/b093104d-b770-4a72-a94f-318611a8032b.png?resizew=155)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a728c306c019b6f51afeadb434842ec.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】小云从正面观察三星堆青铜太阳轮(如图所示),发现它的正面图形可近似地看作是将圆五等分得到的图中角
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.60° | B.70° | C.72° | D.75° |
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【推荐2】如图,在数轴上,点E对应的实数最可能的是( )
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A.1 | B.![]() | C.![]() | D.2 |
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