《从勾股定理到图形面积关系的拓展》中有如下问题:如图①分别以直角三角形的三条边为边,向直角三角形外分别作正三角形,则图中的
,
,
满足的数量关系是______ ;现将
向上翻折,如图②,已知
,
,
,则
的面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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23-24八年级下·山西吕梁·阶段练习 查看更多[2]
山西省吕梁市石楼县多校联考2023-2024学年八年级下学期月考数学试题(已下线)专题10 期末选填压轴题(十一大题型)-【好题汇编】备战2023-2024学年八年级数学下学期期末真题分类汇编(山东专用)
更新时间:2024-04-11 02:22:59
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【推荐1】如图,
为
的直径,弦
,垂足为点E,连接
,若
,则
等于___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,在菱形
中,
,点
在边
上,将
沿直线
翻折
,得到
,点
的对应点是点
.若
,
,则
的长是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
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【推荐1】如图所示为一种“羊头”形图案,其作法是:从正方形①开始,以它的一边为斜边,向外作等腰直角三角形,然后再以其直角边为边,分别向外作正方形②和②’,…,依此类推,若正方形①的面积为
,则正方形⑤的面积为________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/287bc183470f0968172fb10cd7688448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e31351d7b971bda5c97c662fc71103a.png)
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【推荐2】勾股定理是人类最伟大的科学发现之一.如图1,以直角三角形
的各边为边分别向外作正方形,再把较小的两张正方形纸片按图2的方式放置在最大的正方形内,三个阴影部分面积分别记为
,
,
,若已知
,
,
,则两个较小正方形纸片的重叠部分(四边形
)的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐1】如图,将平行四边形ABCD沿对角线AC翻折,点B落在点E处,CE与AD相交于点F,若AB=2,△CDF为等边三角形,则AC的长为________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/9bfaf17f-82ab-4e6d-a5ce-5eb6537edf8f.png?resizew=216)
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【推荐2】如图,正方形
的边长为1,点E是
边上的一点,将
沿着
折叠得
.若
,
恰好都与正方形
的中心
为圆心的
相切,则折痕
的长为_______ .
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