如图,在正方形ABCD中,AB=5,点M在CD的边上,且DM=2,△AEM与△ADM关于AM所在的直线对称,将△ADM按顺时针方向绕点A旋转90°得到△ABF,连接EF,则线段EF的长为( )
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更新时间:2020-02-20 20:55:39
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【推荐1】如图,正方形ABCD的边长为3cm,∠ABE=
,且AB=AE,则DE的长度为( )
![](https://img.xkw.com/dksih/QBM/2019/3/4/2153324197126144/2153898089947136/STEM/0fa534df-87c1-4889-a8ec-d5be2e591e0c.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c6344f4cb0181eb91a1aacf203356f.png)
![](https://img.xkw.com/dksih/QBM/2019/3/4/2153324197126144/2153898089947136/STEM/0fa534df-87c1-4889-a8ec-d5be2e591e0c.png?resizew=163)
A.3 | B.4 | C.5 | D.6 |
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【推荐2】在如图所示的正方形
中,点E在边
上,把
绕点C顺时针旋转得到
,且
,则旋转角的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/1e56385e-7083-4fcb-b179-a377826183ea.png?resizew=208)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c60020854430c59af2b092b691d447f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/1e56385e-7083-4fcb-b179-a377826183ea.png?resizew=208)
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【推荐1】如图,直线a与直线b交于点A,与直线c交于点B,∠1=120°,∠2=40°,若使直线b与直线c平行,则可将直线b绕点A逆时针旋转( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/6309c6c9-b1b3-4c3c-8fb1-8fa853af3c2a.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/6309c6c9-b1b3-4c3c-8fb1-8fa853af3c2a.png?resizew=193)
A.15° | B.20° | C.25° | D.30° |
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【推荐2】如图,将边为
的正方形ABCD绕点A逆时针方向旋转30°后得到正方形AEFH,则图中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422029973905408/2422960311894016/STEM/0a416bf755204ea2ad5a9dcac52da36d.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422029973905408/2422960311894016/STEM/0a416bf755204ea2ad5a9dcac52da36d.png?resizew=141)
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