(1)【探究发现】如图①,已知四边形
是正方形,点E为
边上一点(不与端点重合),连接
,作点D关于
的对称点
,
的延长线与BC的延长线交于点F,连接
.
①小明探究发现:当点E在
上移动时,
.并给出如下不完整的证明过程,请帮他补充完整.
证明:延长
交
于点G.
②进一步探究发现,当点
与点F重合时,
.
(2)【类比迁移】如图②,四边形
为矩形,点E为
边上一点,连接
,作点D关于
的对称点D,
的延长线与
的延长线交于点F,连接
,
,
.当
,
,
时,求
的长;
(3)【拓展应用】如图③,已知四边形
为菱形,
,
,点F为线段
上一动点,将线段
绕点A按顺时针方向旋转,当点D旋转后的对应点E落在菱形的边上(顶点除外)时,如果
,请直接写出此时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f89dba710037b0359da839c7151aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2306b27b690606d511f39b2020ca58d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/5026e359-c0e8-435a-bbf1-1bf1ba7a2a1f.png?resizew=147)
①小明探究发现:当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32577dda778c0bd267c4ece7bfcacf76.png)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
②进一步探究发现,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b6d0cf1c51302804d95d715178a7dc.png)
(2)【类比迁移】如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1723086ae53a032238077a2a36d8d2a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669bb898f4f8c91b7aed0a890c575311.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/ca6628a5-8efb-4f86-8657-a7eb5a62d369.png?resizew=146)
(3)【拓展应用】如图③,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef972853e8a32b5750627b3b6d7f246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/55aec05d-a4e6-4027-a989-826373127e08.png?resizew=256)
更新时间:2023-08-02 06:01:58
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(2)已知正方形
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名校
【推荐2】如图,在
中,
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绕点
逆时针旋转得到
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(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求
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解答题-证明题
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【推荐1】如图,四边形
为正方形,且
是边
延长线上一点,过点
作
于
点,交
于
点,交
于
点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/1537ce82-faaf-49ef-b40c-de2cd2d45274.jpg?resizew=159)
(1)求证:
;
(2)求证:
;
(3)连接
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c5b1f09304e13bf30161a3069a3a2f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c9d29818f14596a0ecd7d412d47cc6.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfe3f2c19beb2513f3b27b764d98094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
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解答题-证明题
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【推荐2】如图,E为
上一点,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/8eb97b3d-3a11-45fb-80bd-ce5f98b52e0e.png?resizew=193)
(1)求证:
;
(2)若
平分
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957f7c12d78b98b78b114f24510084a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/8eb97b3d-3a11-45fb-80bd-ce5f98b52e0e.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3770fce651105106bee90defe692cf51.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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