将正方形
绕点
按逆时针方向旋转
,得正方形
,
交
于点
,
,则四边形
的内切圆半径为( ).
![](https://img.xkw.com/dksih/QBM/2015/9/1/1573908568227840/1573908574404608/STEM/3430d3e4332c4fe8949a2bd62c6de61b.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad194a7c911eef46cf9a07eb4d6096f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df9c53412efbc739c43192cf5a659df.png)
![](https://img.xkw.com/dksih/QBM/2015/9/1/1573908568227840/1573908574404608/STEM/3430d3e4332c4fe8949a2bd62c6de61b.png?resizew=138)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2016-12-06 02:28:06
|
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【推荐1】如图,
中,
,分别以
、
、
为边在
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、
、
,四块阴影部分的面积分别为
、
、
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【推荐2】如图,矩形ABCD的两条对角线相交于点O,∠AOB=120°,AD=2,点E是BC的中点,连结OE,则OE的长是( )
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