如图,长方形ABCD中,AB=3,BC=4,点E是BC边上任一点,连接AE,把∠B沿AE折叠,使点B落在点B′处,当CE的长为_____ 时,△CEB′恰好为直角三角形.
![](https://img.xkw.com/dksih/QBM/2020/6/14/2484244401872896/2490879868518400/STEM/77af7f3f9f704b4fba7523289818995c.png?resizew=163)
更新时间:2020-06-23 15:30:58
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【推荐1】如图在矩形ABCD中,点E是线段AB上一点,且满足5AE=13BE,将
AED沿ED所在直线翻折,点A恰好落在线段BC上点
处,连接AC交线段
于点M,若AB的长为9,则
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【推荐2】如图,菱形纸片ABCD,AB=4,∠B=60°,将该菱形纸片折叠,使点B恰好落在CD边的中点B′处,折痕与边BC、BA分别交于点M、N.则BM的长为_______________ .
![](https://img.xkw.com/dksih/QBM/2020/7/18/2508677710381056/2509444194639872/STEM/5c557b3cd3e3487a8a2d8f7294d9aa4d.png?resizew=173)
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【推荐1】如图,矩形
中,
为
上一动点(
与
不重合),将
沿
翻折至
,
与
相交于点
,
与
相交于点
,连接
交
于
,若
,则
的长=______ ,折痕
的长_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f97ae9200c51cd2e251b91327f1cd05.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】如图,长方形
中,
,点
、
分别为线段
、
上动点,且
,点
是线段
上一点,且满足
,四边形
关于直线
对称后得到四边形
,连接
,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101f8785e19f1b7e8f68ade2d1ccbcb2.png)
_____ 时,点
与点
重合,在运动过程中,线段
长度的最大值是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6beb12c57068293d0f5d99ea429f92.png)
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