如图,
,
,将
绕点
顺时针旋转角度得到△
,旋转角
为.若点
落在
上,则旋转角
的大小是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370186688020480/2371349587124224/STEM/7b2a4df545b44537906c8aafbba66333.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76830a81cc960a3427433c7cf1e7f475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370186688020480/2371349587124224/STEM/7b2a4df545b44537906c8aafbba66333.png?resizew=190)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-01-06 18:25:59
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,
,
,
…….且
在直线m上,将
绕点A顺时针旋转到点
,将位置①的三角形绕点
顺时针旋转到位置②,可得到点
,此时
将位置②的三角形绕点
顺时针旋转到位置③,可得到点
,此时
;…,按此规律继续旋转,直到得到点
为止,则
( )
![](https://img.xkw.com/dksih/QBM/2022/11/13/3108847963832320/3110735901884416/STEM/8504d3fab09548cc974ec4ca9d07e442.png?resizew=335)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af31946aad4635c22fea3413e27b289d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa76939b9ae6bbd5370a4902f3729789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39ad8bbb343f2603ddc865fff66b303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32037f8ca58c86376af0ecd5e176964d.png)
![](https://img.xkw.com/dksih/QBM/2022/11/13/3108847963832320/3110735901884416/STEM/8504d3fab09548cc974ec4ca9d07e442.png?resizew=335)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,在正方形ABCD中,E为DC边上的点,连接BE,将△BCE绕点C顺时针方向旋转90°得到△DCF,连结EF,若∠BEC=70°,那么∠CEF的度数为( )
![](https://img.xkw.com/dksih/QBM/2016/12/20/1633713335828480/1633713336049664/STEM/93121f15a9644d36a529d142b15c73eb.png)
![](https://img.xkw.com/dksih/QBM/2016/12/20/1633713335828480/1633713336049664/STEM/93121f15a9644d36a529d142b15c73eb.png)
A.20° | B.25° | C.40° | D.45° |
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解题方法
【推荐1】如图,在平面直角坐标系中,点
点
在
轴的正半轴上,
,现把
绕点
顺时针旋转30°得到
,点
恰好落在一次函数
的图象上,则
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/b99adc59-b939-4ab7-96a4-446f635ea209.png?resizew=227)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b136c45d114d9432aa492909cda4f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21e44af368f3336354704d92609f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f918f3126b7fe52e2ffcd2917b8c994d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/b99adc59-b939-4ab7-96a4-446f635ea209.png?resizew=227)
A.1 | B.![]() | C.2 | D.![]() |
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【推荐2】如图,在平行四边形
中,
,
,
,将
绕点
顺时针旋转一定角度后,得到
,则平行四边形
的对角线
的长为( )
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941063338065920/2945848547254272/STEM/9d993f51-9776-4e08-9d5a-6732a609a3ef.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0434c0177ca5c88ec129bd4cc13f4a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9ded5dac356fc6dd28bc005ae0bd3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941063338065920/2945848547254272/STEM/9d993f51-9776-4e08-9d5a-6732a609a3ef.png?resizew=206)
A.![]() | B.![]() | C.![]() | D.![]() |
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