如图所示,折叠矩形ABCD的一边AD,使点D落在BC边上的点F处,已知AB=6,BC=10,
(1)求BF的长;
(2)求
ECF的面积.
(1)求BF的长;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892859365015552/2893723653791744/STEM/6b409857-e5b5-4fe9-a47d-aba4f131d6eb.png?resizew=206)
更新时间:2022-01-13 19:18:45
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在矩形
中,O是对角线
中点.过O点的直线与矩形的一组对边
,
分别相交于点F,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/db996989-5791-4101-9922-f49f32a924bb.png?resizew=186)
(1)求证:
;
(2)点
与B关于直线
对称,连接
.
①求证:
;
②若
,且四边形
是平行四边形,求线段
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/db996989-5791-4101-9922-f49f32a924bb.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c502b3f22fab431264a3721b4f53f1a.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a452233432a882dffc39135ef234bd.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bacdeab3ad2d84ce6a3301946c61e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a862ee54fc0f3569fdc1d6eb359ec44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
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适中
(0.65)
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【推荐2】如图,矩形ABCD中,AB=10,BC=8,E为AD边上一点,沿CE将△CDE对折,使点D正好落在AB边上F处,求tan∠AFE.
![](https://img.xkw.com/dksih/QBM/2018/6/20/1971392335265792/1972104440446976/STEM/9bc93c4f931745f69e2e46e889654707.png?resizew=100)
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