如图,正方形ABCD的边长为4,E是AD边的中点,连接BE,将△ABE沿直线BE翻折至△FBE,延长EF交CD于点G,则CG的长度是( )
![](https://img.xkw.com/dksih/QBM/2021/7/18/2766636982788096/2830391407181824/STEM/a601ec50452c44a98a4bbb35643bc9a7.png?resizew=129)
![](https://img.xkw.com/dksih/QBM/2021/7/18/2766636982788096/2830391407181824/STEM/a601ec50452c44a98a4bbb35643bc9a7.png?resizew=129)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-10-16 07:48:58
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【推荐1】如图,D为△BAC的外角平分线上一点并且满足BD=CD,过D作DE⊥AC于E,DF⊥AB交BA的延长线于F,则下列结论:
①△CDE≌△BDF;
②CE=AB+AE;
③∠BDC=∠BAC;
④∠DAF=∠ACD.
其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/f7718ec9-05e1-48c3-8488-0e5f8dd6b0eb.png?resizew=154)
①△CDE≌△BDF;
②CE=AB+AE;
③∠BDC=∠BAC;
④∠DAF=∠ACD.
其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/f7718ec9-05e1-48c3-8488-0e5f8dd6b0eb.png?resizew=154)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在图纸上画有,
平分
,定点P在
上.将夹角为
的角尺任意放在图纸上,使角尺的顶点与点P重合,两边分别交射线
,
于点M,N(均不与点O重合).关于甲、乙的说法,下列判断正确的是( )
甲:始终等于
;
乙:四边形的面积为定值
A.甲、乙都对 | B.甲、乙都错 | C.甲对乙错 | D.甲错乙对 |
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【推荐1】如图1,在菱形
中,
,P是菱形内部一点,动点M从顶点B出发,沿线段
运动到点P,再沿线段
运动到顶点A,停止运动.设点M运动的路程为x,
,表示y与x的函数关系的图象如图2所示,则菱形
的边长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d797e61097c9452c1e5b6e49d33899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.4 | C.![]() | D.2 |
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【推荐2】如图,在
中,D、E分别是BC、AC的中点.已知
,
,
则AB的长为( )
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859549442883584/2899371770683392/STEM/de16d6b8-03c5-4986-a417-a6a7d2d6d327.png?resizew=219)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
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![](https://img.xkw.com/dksih/QBM/2021/11/26/2859549442883584/2899371770683392/STEM/de16d6b8-03c5-4986-a417-a6a7d2d6d327.png?resizew=219)
A.10 | B.![]() | C.![]() | D.8 |
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【推荐1】如图,正方形ABCD的边长为4,点E在边CD上,且CE=1,连结AE,点F在边AD上,连结BF,把
沿BF翻折,点A恰好落在AE上的点G处,下列结论:①AE=BF;②AD=3DF;③
;④GE=0.2,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a181330d7f532912463a38694db2d8.png)
A.①②③④ | B.①③④ | C.①②③ | D.①③ |
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【推荐2】如图,边长为2的正方形
的对角线
与
交于点
,将正方形
沿直线
折叠,点
落在对角线
上的点
处,折痕
交
于点
,则
长是( )
![](https://img.xkw.com/dksih/QBM/2022/6/13/3000576330399744/3001309933371392/STEM/2223c7d3cbaf4db9af1c986addaa7c2f.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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