如图,
是
的直径,点
为圆上一点且
,
是劣弧
的中点,连接
,
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4a73052e7d7828ecc0589beca27778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-08 13:15:47
|
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【推荐1】如图,AB是⊙O的直径,C、D是⊙O上的点,若∠ABC=54°,则∠BDC等于( )
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480749377462272/2481437087604736/STEM/2873682c26b44126a49d15e4cc9e149d.png?resizew=124)
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A.36° | B.54° | C.72° | D.108° |
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【推荐2】如图,在平面直角坐标系中,已知
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则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0c2e50c74aed2741aacb706c700a2a.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,四边形ABCD内接于圆O,对角线AC是圆O的直径,DB平分
,AC长6cm,求阴影部分的面积( )
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896561822932992/2955105935491072/STEM/a64284001fe246b2b2f4954af36ed00a.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知,AB是⊙O的直径,且C是圆上一点,小聪透过平举的放大镜从正上方看到水平桌面上的三角形图案的∠B(如图所示),那么下列关于∠A与放大镜中的∠B关系描述正确的是( )
![](https://img.xkw.com/dksih/QBM/2011/12/16/1573306581934080/1573306609197056/STEM/5719b6c87b9b44cd87934f6a3e3a42cb.png)
![](https://img.xkw.com/dksih/QBM/2011/12/16/1573306581934080/1573306609197056/STEM/5719b6c87b9b44cd87934f6a3e3a42cb.png)
A.∠A=∠B | B.∠A+∠B=90° |
C.∠A+∠B>90° | D.∠A+∠B的值无法确定 |
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