已知正六边形边长为a,则它的内切圆面积为_______ .
更新时间:2017-12-12 20:21:24
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【推荐1】如图,正五边形
的边长为2,以
为边作等边
,则图中阴影部分的面积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/2021/4/10/2696660839333888/2696691816218624/STEM/d5468ef4-f648-4526-a994-2316f36ad824.png?resizew=162)
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【推荐2】如图,在平面直角坐标系中,将边长为1的正六边形
绕点O顺时针旋转n个45°,得到正六边形
,当
时,正六边形
的顶点
的坐标是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe0c0d8cfbfd71daf02f8bda07ab736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4b71a3e2ded01c2897a7998eff6a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2521506a29dfa82b76370f6621b5e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99923f2daffd02075e606767416446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa9795a531a15fa40aad1c1725958572.png)
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