如图,矩形
中,以D为圆心,
长为半径画弧,交
边于点E,连接
.
,
,则图中阴影部分的面积___________ .(结果不取近似值)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5f374024260b8d0083f41c2bb825b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/d4be4e5f-81f8-4aea-8ae6-f745e2e689f1.png?resizew=158)
更新时间:2023-11-02 12:05:37
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【推荐1】如图,
是矩形
的对角线,
,垂足为
,点
,
分别在线段
,
上,
.若
是以
为腰的等腰三角形,
,
,则
的长是______ .
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【推荐2】如图,直线
与直线
所成的角
,过点
作
交直线
于点
,
,以
为边在
外侧作等边三角形
,再过点
作
,分别交直线
和
于
,
两点,以
为边在
外侧作等边三角形
,…按此规律进行下去,则第2022个等边三角形
的周长为______ .
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【推荐1】如图,在矩形
中,
的平分线交边
于点E,M,N分别是边
,
上的动点,且
是线段
上的动点,连接
,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50de2fc8b37b154bcde2771f7407bd97.png)
__________ 时,
的值最小.
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【推荐2】如图,在矩形ABCD中,
,
,E为AD中点,F,G分别是AB,CD上的动点,且
,连接CE,FG交于点O,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8eadb9d2378e557068a82ffc5e30f10.png)
______ .
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【推荐1】如图,在正方形中ABCD中,AD=4,E是AB的中点,将△BEC绕点B逆时针旋转90o后,点E落在CB的延长线上点F处,点C落在点A处.再将线段AF绕点F顺时针旋转90o得线段FG,连接EF,CG.则点C,点A在旋转过程中形成的
、
与线段CG所围成的阴影部分的面积_______ .
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【推荐2】如图,
是半圆
的直径,
是弦,点
为
上一点,以点
为圆心,
为半径的半圆交
于另一点
,与
相切于点
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,
,则图中阴影部分的面积是______ .
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【推荐1】已知,直角梯形的上底为12厘米,下底为18厘米,高为12厘米.正方形的边长为13厘米,起始状态如下图所示.若正方形固定不动,把直角梯形以2厘米/秒的速度向右沿直线平移,设直角梯形的平移时间为t秒,两个图形的重叠部分面积为S平方厘米,则当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14fade3d1f7c38ced0102816d2bc6ae5.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7842432541fe2f87e688a89ab8b10d40.png)
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【推荐2】如图,三个正方形的边长分别为
,若
,则阴影部分的面积为_______ .
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