如图,
中,
,
,
,点
在边
上,将
沿着直线
翻折得
,
交直线
于点
,连接
,若
是等腰三角形,则
的长是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9620e97567191461f1a87aebb7b4f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96715995549e5e48494101570bb3bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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21-22九年级上·上海浦东新·期末 查看更多[5]
上海市浦东新区建平实验中学2021-2022学年九年级上学期期末数学试题上海市建平实验中学2021-2022学年九年级上学期期末数学试题上海市浦东建平实验2022-2023学年九年级上学期数学期末练习(一模)上海市松江民乐学校2023-2024学年九年级上学期第二次月考数学试题(已下线)专题03 填空小压轴图形的翻折、旋转(68题专练)-备战2024年中考数学考试易错题(上海专用)
更新时间:2022-02-07 15:02:24
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【推荐1】
中,
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________ .(用含a,b的式子表示)
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【推荐2】如图,已知等边
的面积是
,边长是4,
平分
交
与点
.
(1)若点
为
边中点,在
上是否存在点
,使
最小?最小值是 __ ;
(2)若点
为
边任意一点,在
上是否存在点
,使
最小?最小值是 __ .
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(1)若点
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(2)若点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,在平面直角坐标系中,
是直线
:
上的一个动点,
的半轻为1,过点
作
的切线,切点为
,则
长度的最小值为______ .
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【推荐2】如图,在菱形ABCD中,AC,BD相交于点O,OD=2,将BC绕点B逆时针旋转得到BE,交CD于点F,且使得DE⊥BD.若AC=4DE,则CF=___ .
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【推荐1】如图,在半圆
中,直径
,
是半圆上一点,将弧
沿弦
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于
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的中点.连接
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【推荐2】如图,在平面直角坐标系中,点
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与
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轴分别交于点
、
,点
在
轴负半轴上,且
,把
沿
轴翻折,使点
落在
轴上的点
处,点
为线段
上一点,连接
交
轴于点
,若
,点
的纵坐标为
,则直线
的解析式为__________ .
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【推荐1】把一个三角形绕其中一个顶点逆时针旋转并放大或缩小(这个顶点不变),我们把这样的三角形运动称为三角形的
变换,这个顶点称为
变换中心,旋转角称为
变换角,三角形与原三角形的对应边之比称为
变换比;已知
在直角坐标平面内,点
,
,
,将
进行
变换,
变换中心为点B,
变换角为60°,
变换比为
,那么经过
变换后点A所对应的点的坐标为___________ .
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【推荐2】如图,已知等腰△ABC中,AC=BC,点D、E、F分别是线段AC、BC、AD的中点,连接FE、ED,BF的延长线交ED的延长线于点G,连接GC.
(1)求证:EF∥CG;
(2)若AC=
AB,求证:AC=CG;
(3)如图2,若CG=EG,则
= .
(1)求证:EF∥CG;
(2)若AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)如图2,若CG=EG,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746853ea6d76bd7cccc6bdd6c739aed7.png)
![](https://img.xkw.com/dksih/QBM/2016/12/22/1633714644828160/1633714645196800/STEM/d061b34ec54e4e0f95d45554e3f3bdc4.png)
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