如图,□ABCD中,M是BC的中点,且AM=9,BD=12,AD=10,则该平行四边形的面积是___ .
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574212943462400/1574212948959232/STEM/744b2afc666647b59043548b4b94a9c8.png?resizew=193)
15-16九年级下·山东德州·阶段练习 查看更多[4]
2016届山东省德州市夏津县九年级下学期第一次练兵考试数学试卷【全国百强校】重庆市巴蜀中学2018-2019学年八年级(下)第一次定时作业数学试卷湖南省长沙市长郡教育集团湘郡金海中学2019-2020学年八年级下学期第一次月考数学试题(已下线)【万唯原创】2018年陕西省-红绿蓝-(红卷)易错题集训5
更新时间:2016-12-06 12:47:21
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【推荐1】图,在平行四边形ABCD中,AB=10,BC=15,tan∠A=
点P为AD边上任意一点,连结PB,将PB绕点P逆时针旋转90°得到线段PQ.若点Q恰好落在平行四边形ABCD的边所在的直线上,则PB旋转到PQ所扫过的面积____ (结果保留π)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
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【推荐2】已知在等腰梯形
中,
,
,
,
,它的中位线长为_________
.
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【推荐1】何老师在一次“探析矩形折叠问题”的公开课上,与同学们一起对折纸进行了如下探究:已知正方形
边长为1,G是
边的中点,E是射线
上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/5ba3916f-b578-4d14-94fe-9881c678bf9d.png?resizew=270)
(1)如图① ,若点E在线段
上且点E与点C不重合,连结
,将
沿着
翻折,使点C落在
上的点M处,连结
延长交
边于点F且
,则
的值为_____
(2)若点E与点C不重合,以点C为圆心,线段
的长为半径作
,当
与线段
只有一个公共点时,
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/5ba3916f-b578-4d14-94fe-9881c678bf9d.png?resizew=270)
(1)如图① ,若点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad366e8cad328b89069ec588850d62.png)
(2)若点E与点C不重合,以点C为圆心,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
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【推荐2】如图,在
中,点
、
分别在
、
上,
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的值为______ .
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