如图,正五边形
绕点
顺时针旋转后得到正五边形
,旋转角为
(
),若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcee5cf673e4e2bf0c60661c9037f2d.png)
___________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956dc11e07b5b3bca7ae44686868809a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391c91d4fd0ffca7913b36b761a0cdd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f3b58f512a670c82de4c4ad163e0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcee5cf673e4e2bf0c60661c9037f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
![](https://img.xkw.com/dksih/QBM/2019/3/4/2153294015389696/2155172492410880/STEM/3ec850a295ae4a0ea86dff6e9c84f94c.png?resizew=194)
更新时间:2019-03-07 08:12:34
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适中
(0.65)
【推荐1】如图,在等边三角形
中,
,点P在
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c66e4e010a52448e111ed7142c09b.png)
将
绕点B在平面内旋转,点P的对应点为点Q,连接
,
.当
时,
的长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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(0.65)
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【推荐2】
是边长为2的等边三角形,
,点
为
上一个动点.连接
,将线段
绕点
顺时针旋转
得到线段
,当
是直角三角形时,
的长为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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