如图,已知扇形
的半径为
,
是
上的任一点(不与
,
重合),
于点
,
于点
,连结
,若
,则
可表示为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c2ea6a10095a8d03cfe0cb072df8b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbc13f1df25972a117e08f645445202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-04-20 16:59:21
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【推荐1】如图,在△ABC中,∠ABC=∠C,将△ABC绕点B逆时针旋转得△DBE,点E在AC上,若ED=3,EC=1,则EB=( )
![](https://img.xkw.com/dksih/QBM/2020/7/1/2496305848377344/2496738622390272/STEM/91935708e7b74da88a3bd78b9f0169d6.png?resizew=140)
![](https://img.xkw.com/dksih/QBM/2020/7/1/2496305848377344/2496738622390272/STEM/91935708e7b74da88a3bd78b9f0169d6.png?resizew=140)
A.![]() | B.![]() | C.![]() | D.2 |
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【推荐2】如图,E是平行四边形ABCD的BA边的延长线上的一点,CE交AD于点F.下列各式:①
=
;②
=
;③
=
;④
=
.其中成立的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647168623738880/2651447520395264/STEM/c4730d4b-40f7-4fa0-b93d-db36f1dc1c70.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f276ad76c075f4be32ad326d223cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9d4828c0e94f6e191f6983971bb541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f276ad76c075f4be32ad326d223cf3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fc7f0594a67601e8c9f2109222092f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9d4828c0e94f6e191f6983971bb541.png)
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647168623738880/2651447520395264/STEM/c4730d4b-40f7-4fa0-b93d-db36f1dc1c70.png?resizew=159)
A.③ | B.③④ | C.②③④ | D.①②③④ |
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【推荐1】如图,
的直径
,
是弦,
,
,
,
的延长线与
的延长线相交于点
,
的延长线与
的延长线相交于点
,连接
.则下列结论:①
;②
是
的切线;③
两点间的距离是
;④
;正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/eda50213-3be7-47f5-bf62-2026264a5525.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9874eca4abea481fa84eb772a920f9c7.png)
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【推荐2】等角螺线在自然界中很常见.如图,连接大正六边形六条边的中点,形成一个小的正六边形,再连接小正六边形六条边的中点,形成一个更小的正六边形,重复多次,可形成以逆时针方向环绕的等腰三角形串(如阴影部分所示),这个三角形串就是一个简单的等角螺线.若大正六边形的边长为1,则该等角螺线中第8个等腰三角形的顶角顶点与大正六边形中心的距离为( )
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