如图,正方形纸片
的边长为
,E,
分别是边
,
上的点,将正方形纸片沿
折叠,使得点A落在
边上的点
处,此时点
落在点
处,已知折痕
则
的长等于___________ .
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21-22九年级上·四川雅安·期末 查看更多[4]
四川省雅安市2021-2022学年九年级上学期期末数学试题(已下线)专题7.1 全册综合测试卷-2023-2024学年九年级数学上册举一反三系列(北师大版)(已下线)专题02 特殊的平行四边形(十三大题型)-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(山东专用)(已下线)专题05 勾股定理(十一大题型)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(山东专用)
更新时间:2024-01-09 09:32:37
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,D,E是边AB上的点,连接CD,CE,先将边AC沿CD折叠,使点A的对称点A'落在边AB上;再将边BC沿CE折叠,使点B的对称点B'落在CA'的延长线上.若AC=15,BC=20,则下列结论:①EB'∥CD,②∠DEC=45°,③EA'=3,④S△BCE=18.其中正确的是_______ (将所有正确答案的序号都填在横线上).
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863619129114624/2874305290993664/STEM/cb15b15d-914f-4f7c-9b3d-4c62b22b3bf5.png?resizew=197)
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【推荐2】已知在
中,
,
,点
在边
上,连结
,将
沿
翻折,点
落在平面内点
处,边
交边
于点
,连结
,如果
,则
的值为______ .
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【推荐1】如图,在正方形ABCD中,E为对角线AC上且与点A、C不重合的一个动点,过点E作
于点F,
于点G,连接DE、FG
(1)FG与DE的数量关系是______ ;
(2)若正方形ABCD的边长为6,且
,则DE的长为______ ;
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(1)FG与DE的数量关系是
(2)若正方形ABCD的边长为6,且
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【推荐2】如图,在
中,
,
为边
上一动点,
于
,
于
,连接
,则
的最小值为_________________ .
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【推荐1】如图所示,
是等腰直角三角形,
,直角边与正方形
的边长均为2,且
与
在同一直线上,开始时点
与点
重合,让
沿这条直线向右平移,直到点A与点
重合为止.设
的长为
,
与正方形
重合部分(图中阴影部分)的面积为
,则
与
之间的函数关系是______ .
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【推荐2】如图,边长为2的正方形ABCD绕点A逆时针旋转45°后得到正方形AB1C1D1,连接B1C,边B1C1与CD交于点O,则图中阴影部分的面积为_____ .
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