在平行四边形ABCD中,点P是AB上一点(不与A、B重合),连接DP交对角线AC于点E,连接BE.
![](https://img.xkw.com/dksih/QBM/2021/3/15/2678488400871424/2681089322033152/STEM/cc5480258b8f46bfa37f5cc5ef6b6a48.png?resizew=383)
(1)如图1,若∠EBC=∠EPA,EC平分∠DEB,证明:四边形ABCD为菱形.
(2)如图2,对角线AC与BD交于点O,当P是AB的中点时,请直接写出与△ADP面积相等的三角形(其中不含以AD为边的三角形).
![](https://img.xkw.com/dksih/QBM/2021/3/15/2678488400871424/2681089322033152/STEM/cc5480258b8f46bfa37f5cc5ef6b6a48.png?resizew=383)
(1)如图1,若∠EBC=∠EPA,EC平分∠DEB,证明:四边形ABCD为菱形.
(2)如图2,对角线AC与BD交于点O,当P是AB的中点时,请直接写出与△ADP面积相等的三角形(其中不含以AD为边的三角形).
20-21九年级下·黑龙江哈尔滨·阶段练习 查看更多[4]
黑龙江省哈尔滨市风华中学2020-2021学年九年级下学期二月月考数学试题(已下线)第十八章 平行四边形 单元测试-2020-2021学年八年级数学下册十分钟同步课堂专练(人教版)(已下线)期中检测卷01-2020-2021学年八年级数学下册期末突破易错挑战满分(人教版)四川省达州市达州外国语学校2023-2024学年九年级上学期第一次月考数学试题
更新时间:2021-03-19 09:13:06
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【推荐1】如图,在□ABCD中,BE⊥CD,点E为垂足,AF=CE,求证:四边形BEDF是矩形.
![](https://img.xkw.com/dksih/QBM/2020/7/24/2512836452540416/2513701311479808/STEM/ed1dacc4-294d-47eb-9520-2bedc970b50e.png)
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【推荐2】如图,在平行四边形
中,
,E,F是对角线
上的点,且
,连接
,
,
,
.求证:四边形
是菱形.
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【推荐1】某校课后延时兴趣小组尝试用尺规来“作一条线段的三等分点”,请认真阅读下面的操作过程并完成相应的学习任务.
如图,①分别以点
,
为圆心,大于
的长为半径在
两侧画弧,四段弧分别交于点
,点
;②连接
,
,
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;③以
为圆心,
的长为半径画弧,交射线
于点
;④连接
,交
于点
.点
即为
的一个三等分点(即
.
学习任务:
的形状是 ; 你的依据是 ;
(2)证明:
如图,①分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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(2)证明:
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【推荐2】如图,
,E是
的中点,
平分
,请仅用无刻度的直尺 按要求完成以下作图(保留作图痕迹).
,其中
.
(2)在图2中作菱形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
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(2)在图2中作菱形
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