如图,在
中,
,将其绕
点顺时针旋转一周,则分别以
、
为半径的圆形成一圆环.为求该圆环的面积,只需测量一条线段的长度,这条线段应是( )
![](https://img.xkw.com/dksih/QBM/2018/11/18/2078253461528576/2080443245182976/STEM/9a3c712fbf9e40318143643e93e075a2.png?resizew=72)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4457aacb176adef9b80531504abc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72cfdd0b9f795b314fdbe718b93f37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707a28156a14a96c771a3b933aa76d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c72171ccd9796fbb7b493a2d927a39.png)
![](https://img.xkw.com/dksih/QBM/2018/11/18/2078253461528576/2080443245182976/STEM/9a3c712fbf9e40318143643e93e075a2.png?resizew=72)
A.AD | B.AB | C.BC | D.AC |
2011·江西·中考模拟 查看更多[2]
更新时间:2016-12-05 07:40:48
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【推荐1】如图,过⊙O上一点C作⊙O的切线,交⊙O直径AB的延长线于点D.若∠D=40°,则∠A的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/9c072983-8cf6-49e6-89dc-292920d25440.png?resizew=140)
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A.20° | B.25° | C.30° | D.40° |
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【推荐2】如图,过
外一点
作
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,点
是切点,连接
交
于点
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是
上不与点
,
重合的点.若
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的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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