如图,在正方形
中,点
,
在对角线
上,且
,求证:四边形
是菱形.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/caad20dc-b103-43fa-a90f-df89ebff4772.png?resizew=137)
更新时间:2023-12-16 18:47:44
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解答题-证明题
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适中
(0.65)
【推荐1】如图,点E、F分别是平行四边形ABCD的边BC、AD上的点,且BE=DF.
![](https://img.xkw.com/dksih/QBM/2019/6/27/2234542311636992/2237444585553920/STEM/1ce8bb7dda4148c088f97b4d7ac240eb.png?resizew=217)
(1)求证:四边形AECF为平行四边形;
(2)若AE=BE,∠BAC=90°,判断四边形AECF的形状并证明.
![](https://img.xkw.com/dksih/QBM/2019/6/27/2234542311636992/2237444585553920/STEM/1ce8bb7dda4148c088f97b4d7ac240eb.png?resizew=217)
(1)求证:四边形AECF为平行四边形;
(2)若AE=BE,∠BAC=90°,判断四边形AECF的形状并证明.
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【推荐2】如图,在▱ABCD中,对角线AC与BD相交于点O,过点O作EF⊥AC,EF与AB的延长线交于点E,与CD的延长线交于点F.
求证:四边形AECF是菱形.
求证:四边形AECF是菱形.
![](https://img.xkw.com/dksih/QBM/2018/1/3/1852689920901120/1856195983892480/STEM/780c3a6fb218417a98fed1bcdd29bf24.png?resizew=119)
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解答题-证明题
|
适中
(0.65)
【推荐1】已知:正方形
中,点
是对角线
上一点
和
关于直线
对称,点
是点A的对称点,
(1)如图,
,
相交于
,求证:
;
(2)当
时,求
的值;
(3)直线
,
分别与边
,
交于点
,
,当
时,求
的值.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7654b4dbc0f9ba23055f4cb65560a223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/abc3affe-860b-49ed-af20-c2745e8d8cef.png?resizew=332)
(1)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d0999c4045a250e3b77a39846bd8c3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe446a0456e9168028baee032d8d7d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33fd78b38f63089ddd5922512a1d33.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b858b1e5eeb8b35663809deb024ddd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9de85832bc7efbd75d027e3d8a7e1ac.png)
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【推荐2】已知正方形的四条边相等,四个内角均为90°,如图,点C为线段AB的中点,以BC为边作正方形BCDE,点F,G分别在边DE,DC上,且
,连接BF,连接AG并延长交BF于点H,连接DH.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/970f14fe-33c9-4b3e-bd4d-28351639b2f2.png?resizew=229)
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d99f4c902f24c818c1a817c8d8c7a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/970f14fe-33c9-4b3e-bd4d-28351639b2f2.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e37ba075c1ff468afa5087fc5a600.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fefbb32028bef119d69ee278684aa.png)
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