如图,在菱形ABCD中,AB=4,∠C=60°,将菱形折叠,使点A恰好落在对角线BD上的G点处(不与B,D重合),折痕为EF,若DG=
BG,则BE的长为( )
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869385229737984/2929133661413376/STEM/52417c4294b641c7b969da6bec4b3f53.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869385229737984/2929133661413376/STEM/52417c4294b641c7b969da6bec4b3f53.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
2021·山东青岛·三模 查看更多[6]
2021年山东省青岛市中考数学模拟试卷(三)(已下线)(安徽卷)2022年中考数学第一次模拟考试(已下线)押安徽中考数学第10题(几何与函数探究)-备战2022年中考数学临考题号押题(安徽专用)2022年宁夏银川市第十中学九年级第二次模拟考试数学试题2023年湖北省随州市中考数学九年级第一次模拟考检测卷2023年山东省日照市中考二模数学试题
更新时间:2022-03-04 20:00:36
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【推荐1】如图,
是
的直径,点C是
延长线上的一点,
与
相切于点D,连接
.若
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/fb8434e0-0ac4-4e8c-96ff-8ba118e4457b.png?resizew=191)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/fb8434e0-0ac4-4e8c-96ff-8ba118e4457b.png?resizew=191)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,两块完全相同的含
角的直角三角板
和
叠合在一起,将三角板
绕直角顶点
按逆时针方向旋转角
,有以下四个结论:
①当
时,
与
的交点恰好为
中点;
②当
时,
恰好经过
;
③在旋转过程中,存在某一时刻,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b4cf4158ff965b25028549be5d16a.png)
④在旋转过程中,始终存在
;
共中结论正确的有多少个( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1264a2e3609e1c274acb89b5ea5019.png)
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①当
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②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
③在旋转过程中,存在某一时刻,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b4cf4158ff965b25028549be5d16a.png)
④在旋转过程中,始终存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efb43203acbf1f8ed0a31962a531c03.png)
共中结论正确的有多少个( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,矩形
中,E是
的中点,将
沿直线
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.延长
交
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,
,则
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【推荐2】如图①是一个直角三角形纸片,
,
,将其折叠,使点
落在斜边上的点
处,折痕为
,如图②,再将②沿
折叠,使点
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的延长线上的点
处,如图③,则折痕
的长为
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【推荐1】如图,菱形
的顶点B,C,D在
上,且
与
相切,若
的半径为1,则菱形
的周长为( )
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【推荐2】菱形ABCD的一条对角线长为6,边AB的长是方程x2-7x+12=0的一个根,则菱形ABCD的周长为( )
A.12 | B.14 | C.16 | D.24 |
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【推荐1】如图,在矩形ABCD 中,AB=4,AD=a,点P在AD上,且AP=2,点E是边AB上的动点,以PE为边作直角∠EPF,射线PF交BC于点F,连接EF,给出下列结论:①tan∠PFE=
;②a的最小值为10.则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/10/10/2309081851871232/2311972251156480/STEM/6d0b9819c01647c1afe68097186a9032.png?resizew=189)
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A.①②都对 | B.①②都错 | C.①对②错 | D.①错②对 |
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【推荐2】如图,点
是
的对角线的交点,
的平分线
交
于点
,
,连接
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;②
平分
;③
;④
;⑤
其中正确的个数有( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6e197f21bf9f979f29f000f6ed8677a.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
您最近一年使用:0次