如图,已知四边形ABCD是平行四边形,DE⊥AB,DF⊥BC,垂足分别是E、F,并且DE=DF,求证:
![](https://img.xkw.com/dksih/QBM/2013/7/24/1573671048404992/1573671054065664/STEM/2cfbb6e2ff70469a97638719372c85b2.png?resizew=197)
(1)△ADE≌△CDF;
(2)四边形ABCD是菱形.
![](https://img.xkw.com/dksih/QBM/2013/7/24/1573671048404992/1573671054065664/STEM/2cfbb6e2ff70469a97638719372c85b2.png?resizew=197)
(1)△ADE≌△CDF;
(2)四边形ABCD是菱形.
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2013年初中毕业升学考试(四川遂宁卷)数学2015年人教版初中数学八年级18.2.2练习卷2016届江苏省南京市旭东中学九年级上学期12月月考数学试卷2015-2016学年山东省东营市广饶乐安中学八年级下学期开学数学试卷2016届广西南宁市马山县中考一模考试数学试卷北师大版数学九年级上册第一章 特殊平行四边形 测试题江苏省镇江市丹徒区江心实验学校2018-2019学年八年级下学期3月份调研考试数学试题山东省泰安市东平县东原实验学校2019-2020学年八年级上学期第二次月考数学试题河北省唐山市丰南区2017-2018学年八年级下学期期中数学试题(已下线)【万唯原创】2014年河南省中考数学-面对面-第一部分第五章2江苏省沭阳县修远中学2020-2021学年八年级下学期第一次月考数学试题宁夏回族自治区固原市原州区2020-2021学年八年级下学期期末数学试题四川省广安市邻水县邻水中学2020-2021学年九年级下学期期中数学试题
更新时间:2019-01-30 18:14:09
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【推荐1】如图所示,在△ABC中,AB =AC,E为AB上一点,F为AC延长线上一点,且BE=CF,EF交BC于D,求证:DE=DF.
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解答题-问答题
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【推荐2】已知边长为
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【推荐1】如图,在
中,
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/fb2950fd-93b6-436e-9ecb-f11e4516a5fd.png?resizew=137)
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;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
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【推荐2】如图①,
,AC平分∠BAD,交BF于点C,BD平分∠ABC,且交AC于点O,交AE于点D,连接CD.
![](https://img.xkw.com/dksih/QBM/2022/8/18/3047137527373824/3052296018894848/STEM/d6ecb0a0501247ffa64415fa6a38a81d.png?resizew=405)
(1)求证:四边形ABCD是菱形.
(2)若AC=6,BD=8.点P为射线AE上任意一点,连接PB和PC,如图②.
①菱形ABCD的面积为_______;
②则△PBC的面积为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7dc43a39738e3e2a0b819be505c6e.png)
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(1)求证:四边形ABCD是菱形.
(2)若AC=6,BD=8.点P为射线AE上任意一点,连接PB和PC,如图②.
①菱形ABCD的面积为_______;
②则△PBC的面积为______.
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