如图,四边形ABCD是正方形,点E是边BC的任意一点,连接AE,过点B作BH⊥AE,垂足为H,交CD于点P,将线段PC绕着点P逆时针旋转90°得到线段PQ,连接EQ.
(1)补全图形;
(2)写出AE与EQ的数量关系,并加以证明.
(1)补全图形;
(2)写出AE与EQ的数量关系,并加以证明.
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501363681951744/2502880744972288/STEM/d3cf7bb1807041eaa7af13eb5cd7cf91.png?resizew=222)
更新时间:2020-07-10 14:26:49
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【推荐1】如图,正方形ABCD中,P是AC上一点,E是BC延长线上一点,且PB=PE.若BP=
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图,分别在
的
、
两边上向外作正方形
和
,连接
、
.判断
、
的大小关系?试说明理由.
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【推荐1】如图1,△ABC和△AED都是等腰直角三角形,∠BAC=∠EAD=90°,点B在线段AE上,点C在线段AD上.
(2)如图2,将图1中的△ABC绕点A顺时针旋转角α(0<α<360°),
①(1)中的结论是否成立?若成立,请利用图2证明;若不成立,请说明理由;
②当AC=
ED时,探究在△ABC旋转的过程中,是否存在这样的角α,使以A、B、C、D四点为顶点的四边形是平行四边形?若存在,请直接写出角α的度数;若不存在,请说明理由.
(2)如图2,将图1中的△ABC绕点A顺时针旋转角α(0<α<360°),
①(1)中的结论是否成立?若成立,请利用图2证明;若不成立,请说明理由;
②当AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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【推荐2】已知:
,
,
分别是射线
,
上的点,连接
,以点
为旋转中心,将线段
绕着点
逆时针旋转
,得到线段
,连接
,
.
(1)如图1,当
时,求证:
;
(2)当
时,依题意补全图2,用等式表示线段
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0ab6a6e6771fbce65931b41871d83b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/98387d34-6c26-4d29-be0f-b32a995d4894.png?resizew=263)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1c394c6b7f75268dbbd30b9a19c712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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