如图,在平行四边形
中,
,
,
,过
的中点
作
,垂足为点
,与
的延长线相交于点
,则
的面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74834aa331c843176a65d872da547b55.png)
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20-21八年级下·辽宁大连·期中 查看更多[3]
辽宁省大连市西岗区第三十四中学2020-2021学年八年级下学期期中数学试题(已下线)专题9.30 中心对称图形——平行四边形(全章复习与巩固)(巩固篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)(已下线)YHmlsjsxRJ814.pdf
更新时间:2023-01-08 10:40:16
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【推荐1】如图,
中,
,
,
,点E是直线
上一点,且
,连接
,过点E作
,
(点C,F在直线
两侧),连接
,则
的长是 ___________ .
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【推荐2】如图,在平面直角坐标系
中,点P的坐标为
,将点P绕着原点O顺时针旋转
后的坐标为___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
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【推荐1】如图,将水平放置的三角板
绕直角顶点
逆时针旋转得到
,连接并延长
、
相交于点
,其中
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/640c982d-2a3b-4bc1-bfd6-460e6ba9ff87.png?resizew=204)
(1)若记
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_________ ;
(2)若记点
到直线
的距离为
,则
的最大值为_________ .
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(1)若记
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(2)若记点
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【推荐2】如图,在直角坐标系中,直线
分别与x轴、y轴交于点M、N,点A、B分别在y、x轴上,且
,
,将
绕原点O顺时针转动一周,当
与直线
平行时点A的坐标为 __________ .
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【推荐1】如图,已知正方形ABCD的边长为4,点E为边DC的中点,连结AE,将△ADE沿着AE翻折,使点D落在正方形内的点F处,连结BF、CF,则S△BFC的面积为 .
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【推荐2】已知:如图,
是边长为4的等边三角形,点D是射线
上的动点(不与点B,C重合),
是
的外角的平分线,以点A为顶点,
为一边,作
,
交射线
于点F,连接
.下列结论一定成立的是________ (只填序号).
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点D在线段
上 点D在线段
的延长线上
①
; ②
是等边三角形;
③
; ④
的周长的最小值为
.
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点D在线段
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3549b04dbd5525e8d838361ec1de959b.png)
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③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daeed0de2e2e2f521133abc8dad47d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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【推荐1】如图,平行四边形ABCD中,
,
,
,点E为DC中点,点F为BC上一点,△CEF沿EF折叠,点C恰好落在BD边上的点G处,则
BGF的面积为______ .
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【推荐2】如图,在
中,
,
,
,点D是
上任意一点(不与点A重合),连结
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