如图,正方形ABCD的边长为2,顺次连接正方形ABCD四边的中点得到第一个正方形A1B1C1D1,再顺次连接正方形A1B1C1D1四边的中点得到第二个正方形A2B2C2D2…,以此类推,则第五个正方形A5B5C5D5周长是 _____________ .
![](https://img.xkw.com/dksih/QBM/2021/7/21/2768790037659648/2781794956468224/STEM/c19836df6b0541b5bb5b21cbe11113a7.png?resizew=204)
更新时间:2021-08-08 15:59:14
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【推荐1】如图,
的对角线
、
交于点
,
平分
交
于点
,且
,
,连接
.下列结论:①
;②
;③
;④
,成立的有__________ .(把所有正确结论的序号都填在横线上)
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【推荐2】如图,在△ABC中,∠ACB=90°,M、N分别是AB、AC的中点,延长BC至点D,使CD=
BD,连接DM、DN、MN.若AB=6,则DN=___ .
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【推荐1】三国时期,数学家赵爽绘制了“勾股圆方图”,又叫“赵爽弦图”,如图所示,△ABH、△BCG、△CDF和△DAE是四个全等的直角三角形,四边形ABCD和四边形EFGH都是正方形,如果EF=2,AH=6,那么四边形ABCD的面积等于_____ .
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【推荐2】如图,
、
、
、
是一组平行线,且每两条相邻平行线间的距离均为1,正方形
的四个顶点分别落在这四条直线上,则正方形
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