如图,点D,C在
上,
,
,
.
(1)求证
;
(2)连接
,
,猜想四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b517fe96dfd80e8816cf43bf5a5610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494bf14f8369edcb5ba24413e91fd473.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/250bcfa6-54ba-4b29-a1c9-c58c96099f16.png?resizew=188)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d163ba9cef35eb600387bcfbbda89ac.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
22-23八年级下·辽宁大连·期末 查看更多[3]
辽宁省大连市沙河口区2022-2023学年八年级下学期期末数学试题第18章 平行四边形的判定 18.1 平行四边形的判定华东师大版(2012)八年级下册课后作业(已下线)第08讲 平行四边形的判定-(7大考点+过关检测)-【寒假自学课】2024年八年级数学寒假提升学与练(人教版)
更新时间:2023-07-21 22:10:48
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解答题-问答题
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适中
(0.65)
【推荐1】已知:AD∥BC,AD=CB,AE=CF,请问∠B=∠D吗?为什么?
![](https://img.xkw.com/dksih/QBM/2017/5/5/1680549777293312/1687793158791168/STEM/6b7a28de08f4473c998da3570dd52b77.png?resizew=161)
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解答题-证明题
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适中
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【推荐2】如图,
由
绕点A按逆时针方向旋转90°得到,且点B的对应点D恰好落在BC的延长线上,AD,EC相交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/ebf0d7f6-8699-4e32-8fc4-b0a8ace2ff61.png?resizew=179)
(1)求∠BDE的度数;
(2)F是EC延长线上的点,且
.
①判断
和
的数量关系,并证明;
②求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2bc5547bb6d2a7a315962ff75f6ba8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/ebf0d7f6-8699-4e32-8fc4-b0a8ace2ff61.png?resizew=179)
(1)求∠BDE的度数;
(2)F是EC延长线上的点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962225d329d39d2ccaa11ff85d55cbf9.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72edcfa0679eebe87ce515fa740d83ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977254bd87db56c38d9c06975f941135.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e15dfc58d02504e8c4e3893ae3ba1a.png)
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解答题-证明题
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适中
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【推荐1】如图,在
ABCD中,对角线AC,BD相交于点O,点E,F在对角线BD上,且BE=DF.
(1)求证:四边形AECF是平行四边形;
(2)当∠BAC=90°,AB=3,BC=5时,若四边形AECF是矩形,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
(1)求证:四边形AECF是平行四边形;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/8d3a9ff5-fbc2-423b-a6b3-01e5c695372b.png?resizew=231)
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【推荐2】如图,已知AB∥DF,∠EAB=∠BCF.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313313427095552/2314647603167232/STEM/333a995b2abd4678aebfdf0ba2a30013.png?resizew=146)
(1)判断四边形ABCD的形状,并说明理由;
(2)求证:OB2=OE•OF.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313313427095552/2314647603167232/STEM/333a995b2abd4678aebfdf0ba2a30013.png?resizew=146)
(1)判断四边形ABCD的形状,并说明理由;
(2)求证:OB2=OE•OF.
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