如图,把边长为3的正方形OABC绕点O逆时针旋转n°(0<n<90)得到正方形ODEF,DE与BC交于点P,ED的延长线交AB于点Q,交OA的延长线于点M.若BQ:AQ=3:1,则AM=__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/24138f57-15e3-46c5-b5aa-ff6c3e09788a.png?resizew=143)
2021·四川巴中·中考真题 查看更多[9]
四川省巴中市2021年中考数学真题试卷(已下线)专题27.27 《相似》全章复习与巩固(培优篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)2022年广东省初中学业水平考试数学模拟题2(已下线)专题35 几何图形翻折与旋转【热点专题】(已下线)重难点04 图形变换类问题-2022年中考数学【热点·重点·难点】专练(已下线)(广东广州卷)2022年中考数学第二次模拟考试(已下线)专题20 几何图形的翻折平移旋转变换填空题压轴题专项训练-备战2022年中考数学临考题号押题(全国通用)(已下线)专题31图形的旋转(优选真题60道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【全国通用】(已下线)专题19 几何变换(图形的平移、旋转与对称)-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)
更新时间:2021-08-25 20:39:16
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【推荐1】如图,在
中,
,分别以
、
、
为边向上作正方形,已知
的面积为
,则图中阴影部分面积之和为______ .
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【推荐2】如图,在直角坐标系中,过点
分别向
轴,
轴作垂线,垂足分别为点
,
,取
的中点
,连接
,作点
关于直线
的对称点
,直线
与
交于点
,则直线
的函数表达式为_______ .
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【推荐1】在矩形
中,
,点
为射线
上一点,将
沿着
翻折,使得点
的对应点
落在射线
上,若线段
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的值为______ .
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【推荐2】在四边形ABCD中,AB=BC=CD=DA=5cm,对角线AC,BD相交于点O,且AC=8cm,则四边形ABCD的面积为______ cm2.
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【推荐1】如图,一段抛物线y=-x(x-3)(0≤x≤3),记为C1,它与x轴交于点O,A1;将C1绕点A1旋转180°得C2,交x 轴于点A2;将C2绕点A2旋转180°得C3,交x 轴于点A3;……如此进行下去,得到一条“波浪线”.若点P(35,m)在此“波浪线”上,则m的值为______ .
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【推荐2】如图,
、
都是等腰直角三角形,
,
,若
绕某点逆时针旋转后能与
重合,问:
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(1)旋转中心是______ ;
(2)逆时针旋转______ 度;
(3)若
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(1)旋转中心是
(2)逆时针旋转
(3)若
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名校
【推荐1】综合实践课上,小聪把一张长方形纸片
沿着虚线
剪开,如图①所示,纸片
较小锐角的顶点
在
上,较长直角边与斜边分别交边
于点
,且
为初始位置,把
沿着
方向平移,当点
到达点
后立刻绕点
逆时针旋转,如图③,直到点
与点
重合停止.为了探求
与
之间的变化关系,设
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.
(1)在平移过程中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63abe5f9e5f7bde1b70739bfbb8e4b5f.png)
____________________ ,
(2)在旋转过程中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63abe5f9e5f7bde1b70739bfbb8e4b5f.png)
____________________ .
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(2)在旋转过程中,
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【推荐2】请从以下两个小题中任意选一题作答
A.如图,正方形CDEF内接于Rt△ABC,点D、E、F分别在边AC、AB和BC上,当AD=2,BF=3时正方形CDEF的面积是_____ .
B.比较大小![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
_____
.(填“>”“<”或“=”)
A.如图,正方形CDEF内接于Rt△ABC,点D、E、F分别在边AC、AB和BC上,当AD=2,BF=3时正方形CDEF的面积是
B.比较大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
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