2024八年级下·山东·专题练习
1 . 如图,在
中,
,
,点D为边
的中点,点E是边
上的一个动点,连接
,将
沿
翻折得到
,线段
交边
于点F.当△DEF为直角三角形时,
的长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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2 . 如图,将直角三角形纸片
(
)折叠,使点C的对应点
与斜边
的中点O重合,折痕为
.若
,
,则折痕
的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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3 . 如图,将
,
的矩形纸片
放在直角坐标系中,顶点B、C在x轴上,E为
边上一点,连接
,将纸片
沿
折叠,使点B落在
边与y轴的交点F处,则E点的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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4 . 如图已知长方形
中
,
,在边
上取一点E,将
折叠使点D恰好落在
边上的点F,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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2024-06-01更新
|
345次组卷
|
5卷引用:专题06 特殊平行四边形中折叠、旋转、最值、新定义问题期末真题汇编【四大题型+优选提升题】(原卷版)
(已下线)专题06 特殊平行四边形中折叠、旋转、最值、新定义问题期末真题汇编【四大题型+优选提升题】(原卷版)内蒙古自治区通辽市霍林郭勒市第五中学2023-2024学年八年级下学期3月月考数学试题甘肃省武威市武威第十中学2023-2024学年八年级下学期第一次月考数学试题上海市青浦区教师进修学院附属中学2023-2024学年八年级上学期期末数学试题北京市大峪中学2023-2024学年八年级下学期期中数学试题
2024九年级下·江苏徐州·专题练习
5 . 如图,在等腰直角三角形
中,
,
,点P是边
上任意一点,连接
,将
沿
翻折,点B的对应点为
,当
有一边与
垂直时,
的长为 ___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b33bcb6c77eea836834569a04538899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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2024九年级下·全国·专题练习
6 . 如图,矩形
中,
,
,E是
边上一点,且
,F是
边上一动点,作
,交
边于点G,将
沿着
所在直线折叠,点D的对应点
恰好落在
边上,则
的长为 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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7 . 如图在矩形
中,
,
,
平分
交
于点
,过
作
交
于点
,将
沿
翻折得到
,将
绕点
逆时针旋转角
(其中
),记旋转中的
为
,在旋转过程中,设直线
分别与直线
、直线
交于点
、
,当
时,线段
长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
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8 . 如图,在
中,
,点E,F在边
上,将边
沿
翻折,使点A落在
上的点D处,再将边
沿
翻折,使点B落在
的延长线上的点
处,已知
,
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ec5a6d46df6c070e239ae6d642a54.png)
________
.
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e445fd64446d3fd0afd9ab3fca8af79.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
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2024九年级下·江苏·专题练习
9 . 如图,正方形
的边长是
,
是
边的中点.将该正方形沿
折叠,点
落在点
处.
分别与
,
,
相切,切点分别为
,
,
,则
的半径为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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