如图,在△ABC中,∠ACB=90°,∠ABC=30°,AB=2,将△ABC绕直角顶点逆时针旋转60°得△A'B'C,则线段CB扫过的面积(阴影部分)是( )
![](https://img.xkw.com/dksih/QBM/2020/2/6/2392998412820480/2393317918998529/STEM/14a1d3a3989f499f9e5aea45a4cc5f7c.png?resizew=141)
![](https://img.xkw.com/dksih/QBM/2020/2/6/2392998412820480/2393317918998529/STEM/14a1d3a3989f499f9e5aea45a4cc5f7c.png?resizew=141)
A.![]() | B.![]() | C.π | D.![]() |
更新时间:2020-02-07 16:14:30
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【推荐1】如图是一个餐盘,它的外围是由以正三角形的顶点为圆心,以正三角形的边长为半径的三段等弧组成,已知正三角形的边长为10,则该餐盘的面积是( )
A.50π-50![]() | B.50π–25![]() | C.25π+50![]() | D.50π |
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【推荐2】如图,扇形
圆心角为直角,
,点
在
上,以
,
为邻边构造
、边
交
于点
,若
,则图中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/bab9e115-d098-48b9-a5ba-57d974a02e2b.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在
中,
,将
绕点C顺时针旋转得到
,使点B的对应点E恰好落在边
上,点A的对应点为D,延长
交
于点F,则下列结论一定正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图所示,已知点C在以AB为直径的⊙O上运动,AB=2,以BC为边作等边△BCD,则AD的最大值是( )
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957149297270784/2959275059068928/STEM/1b469a7a-58d3-4682-9316-2c3b951c4df8.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957149297270784/2959275059068928/STEM/1b469a7a-58d3-4682-9316-2c3b951c4df8.png?resizew=162)
A.![]() | B.![]() | C.![]() | D.![]() |
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