如图在矩形纸片
中,
,将矩形纸片折叠,使点
与点
重合,则折痕
的长是( )
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750487404617728/2750671537635328/STEM/a75716b4d0064a668f0ba65883a9c5b4.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1844834ef0315a704d8e2fba77544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750487404617728/2750671537635328/STEM/a75716b4d0064a668f0ba65883a9c5b4.png?resizew=169)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-07-16 21:13:38
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【推荐1】如图,在一张矩形纸片ABCD中,AD=4cm,点E,F分别是CD和AB的中点.现将这张纸片折叠,使点B落在EF上的点G处,折痕为AH.若HG的延长线恰好经过点D,则CD的长为( )
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【推荐2】如图,在矩形ABCD中,AB=3,BC=5,在CD上任取一点E,连接BE,将△BCE沿BE折叠,使点C恰好落在AD边上的点F处,则CE的长为( )
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441172577320960/2441274260340736/STEM/ee0f9e0d4d5f46629c0c78088adedd47.png?resizew=110)
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【推荐1】如图,在菱形ABCD中,对角线AC,BD相交于点O,AC=8,BD=6,则∠BAD的正弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/33029df5-0e2e-47fa-afc2-a3f18bf421d3.png?resizew=113)
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