如图,四边形ABCD是平行四边形,E,F是直线AC上的两点,连接BE,DE,BF,DF.给出以下条件:①BE∥DF;②BE=DF;③AE=CF.请你从中选取一个条件,使∠1=∠2成立,并给出证明.
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716709092401152/2782670549450752/STEM/296827bd-d037-4986-b672-ae0aeb573d04.png)
更新时间:2021-08-09 21:40:38
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解答题-证明题
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【推荐1】已知:如图,平行四边形
中,点E是对角线
上一点,且
.
求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,点E,F在BC上,BE=CF,AB=DC,∠B=∠C,AF与DE相交于点P,点Q为EF的中点,探究PQ与EF的位置关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/63366dff-b1ae-48c9-82d0-becd83328537.png?resizew=192)
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解答题-证明题
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【推荐1】如图,已知点
在一条直线上,
,
,
.
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd157aaee7c9ee1ba28cf9081de8d71.png)
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(2)若
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【推荐2】证明定理:一组对边平行且相等的四边形是平行四边形.
已知:如图,在四边形ABCD中,AB∥CD,AB=CD.
求证:四边形ABCD是平行四边形.
证明:
已知:如图,在四边形ABCD中,AB∥CD,AB=CD.
求证:四边形ABCD是平行四边形.
证明:
![](https://img.xkw.com/dksih/QBM/2019/5/24/2210566538838016/2211518136745984/STEM/4ad0f83a11b04d74989ec567df88284a.png?resizew=160)
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【推荐1】如图,
的对角线
交于点
过点
且分别与
交于点
.
;
(2)记四边形
的面积为
,平行四边形
的面积为
,用等式表示
和
的关系.
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(2)记四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
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【推荐2】如图,将平行四边形ABCD沿着对角线BD折叠,点C的对应点为C′,BC′与AD相交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/28f836ec-ec5c-4b24-9b7a-3ed397f889d0.png?resizew=242)
(1) EB与ED相等吗?证明你的结论;
(2)连接AC′,判断AC′与BD的位置关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/28f836ec-ec5c-4b24-9b7a-3ed397f889d0.png?resizew=242)
(1) EB与ED相等吗?证明你的结论;
(2)连接AC′,判断AC′与BD的位置关系,并说明理由.
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