如图,①②③④⑤五个平行四边形拼成一个含
内角的菱形
(不重叠无缝隙).若①②③④四个平行四边形面积的和为
,四边形
面积是
,则①②③④四个平行四边形周长的总和为( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/b36afb4e-f942-414d-924a-77a317220607.png?resizew=295)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739924983705d43e1d6d8d7f85588e9f.png)
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A.48 | B.24 | C.![]() | D.![]() |
21-22八年级下·浙江宁波·期中 查看更多[4]
浙江省宁波市北仑区2021-2022学年八年级下学期期中数学试题浙江省宁波市精准联盟2021-2022学年八年级下学期期中数学试题(已下线)第18课 菱形-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(浙教版)27-菱形
更新时间:2022-06-19 14:41:48
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【推荐1】如图,四边形ABCD是矩形纸片,
对折矩形纸片ABCD,使AD与BC重合折痕为EF;展平后再过点B折叠矩形纸片,使点A落在EF上的点N,折痕BM与EF相交于点Q;再次展平,连接BN,MN,延长MN交BC于点
有如下结论:
;
是等边三角形;
;
为线段BM上一动点,H是BN的中点,则
的最小值是
其中正确结论的个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2018/8/21/2015334180749312/2018502127034368/STEM/09d025df062b4d1595e65e755c3b995e.png?resizew=160)
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A.1个 | B.2个 | C.3个 | D.4个 |
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解题方法
【推荐2】在边长为12的正方形ABCD中,E为CD边中点,连接AE,将
沿线段AE翻折得到
,延长AF交BC边于点N,连接EN,延长EF交BC边于点G,其中
,连接DF并延长交BC边于点K,连接EK,则下列结论:①
;②
;③
;④
;⑤
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】已知点A(4,0),B(0,﹣4),C(a,2a)及点D是一个平行四边形的四个顶点,则线段CD的长的最小值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在四边形
中,已知
,
,
,则
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【推荐1】如图,是将菱形ABCD以点O为中心按顺时针方向分别旋转90°,180°,270°后形成的图形.若∠BAD=60°,AB=2,则图中阴影部分的面积为( )
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【推荐2】如图,在菱形
中,已知
,将
,
分别沿
,
折叠,若重叠部分面积为1,
的面积为
,则菱形
的面积为( )
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