探究:如图①点E
、F分别在正方形ABCD的边BC、CD上,连结AE、AF、EF,将△ABE、△ADF分别沿AE、AF折叠,折叠后的图形恰好能拼成与△AEF完全重合的三角形.若BE=2,DF=3,求AB的长;
拓展:如图②点E、F分别在四边形BACD的
边BC、CD上,且∠B=∠D=90°.连结AE、AF、EF将△ABE、△ADF分别沿AE、AF折叠,折叠后的图形恰好能拼成与△AEF完全重合的三角形.若∠EAF=30°,AB=4,则△ECF的周长是 .
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/85e30d985b574f37ac8feaee08c9152e.png?resizew=3)
拓展:如图②点E、F分别在四边形BACD的
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/9abdb8b67b72471ca1e06bb830c79afa.png?resizew=3)
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/836b51cf32104e2bb70de33e34b3c22e.png?resizew=315)
更新时间:2019-07-11 21:02:42
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解答题-问答题
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适中
(0.65)
名校
【推荐1】已知:如图,在边长为
的正方形
中,点
在边
上,
,将
沿
折叠至
,延长
交
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/769a338f-2909-4277-9f18-e3a96f2028dc.png?resizew=164)
(1)求
的度数:
(2)求
的长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55c3f663b6b205bb0d541a72e4d4759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/769a338f-2909-4277-9f18-e3a96f2028dc.png?resizew=164)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8349b1776a38935422a941674e1fc39.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在边长为8的正方形
中,E是边
的中点,将
沿
对折至
,延长
交边
于点G,连接
.
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599173380685824/2599239797784576/STEM/ec47e2b89ec64d72bb28386fb5eacca3.png?resizew=141)
(1)求证:
;
(2)求
的度数;
(3)求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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(1)求证:
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(2)求
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(3)求线段
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解答题-证明题
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适中
(0.65)
【推荐1】已知:P是正方形
对角线
上一点,
,
,垂足分别为E、F.
![](https://img.xkw.com/dksih/QBM/2021/7/23/2770426622263296/2781758576918528/STEM/c851ce54-52ca-4544-8c9d-4a854b9a3f08.png)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb350cb6e6764d2fa68f6c4229c24d34.png)
(2)若
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,正方形
的边长为
,点
是
的中点,连接
与对角线
交于点
,连接
并延长,交
于点
,连接
交
于点
,连接
.
;
(2)求证:
;
(3)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(2)求证:
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(3)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
您最近一年使用:0次