如图,在四边形
中,
,
,
,且
,
,则
的长为 ___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c029f2663b3fd557c9169e295c353e8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac943d8c2eb91c0082ada87857d1ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9723635d46664a92d3af26362dfea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/d0c6cd3c-0cad-44f7-9d4d-1b72c9a344ea.png?resizew=224)
更新时间:2023-04-17 10:56:13
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【推荐1】如图,△ABC中,∠BAC=2∠C,BD为∠ABC的平分线,BC=7.6,AB=4.4,则AD=_________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/4412f6d8-1c10-4432-874c-e891eff5c89a.png?resizew=161)
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【推荐2】在
中,
,
,将
绕点
逆时针旋转一定的角度
得到
,点A、
的对应点分别是
、
.如图,是运动中点
恰好在
上;当
时,点
是边
中点,四边形
是________________ (图形).
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【推荐1】如图,已知
,
,将边
绕着点A旋转,当点B落在边
的垂直平分线上的点E时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c44345de7d1f37b48def25db8c5e2b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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【推荐2】图1是一个虎口式夹子的实物图,图2是该夹子的俯视示意图,点O是夹子转轴位置,点O左边是两段相等的夹弧(点A与点B重合),右边是相等两部分夹柄,OE⊥CE于点E,OF⊥DF于点F,CE=DF=4.8m,OA=6cm,OC=OD=CD=5cm.按图示方式用手指按夹子,夹子两边绕点O转动,
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964847219277824/2967367335157760/STEM/dbd8cad2-2ddd-43a0-9488-4c27cac26701.png?resizew=610)
(1)如图3,则E,F两点间距离的最大值是_____ cm;
(2)当C,D重合时,两边夹弧恰好在同一圆上,此时棱长为虎口宽度AB的正方体从虎口伸入夹子的最大长度为____ cm.
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964847219277824/2967367335157760/STEM/dbd8cad2-2ddd-43a0-9488-4c27cac26701.png?resizew=610)
(1)如图3,则E,F两点间距离的最大值是
(2)当C,D重合时,两边夹弧恰好在同一圆上,此时棱长为虎口宽度AB的正方体从虎口伸入夹子的最大长度为
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【推荐1】如图,点N是矩形
的
边上的中点,以点N为圆心、
为直径,在矩形
的内部作出半圆
,以点B为圆心、
为半径在矩形
内部作出四分之一圆
,
与
相交于点M,连接
,已知
,图中阴影部分的面积 ____
.
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【推荐2】如图,△ABC、△ADE都是等腰直角三角形.点C在边AE上,AB=AC=
,AD=AE=
,将△ABC绕点A顺时针方向旋转后得△AB′C′,当点C′恰好落在直线EB′上时,连接B′D,C′D,则△B′C′D的周长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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