如图,在平行四边形ABCD中,AE⊥BD,CF⊥BD,垂足分别为E,F.
(1)写出图中所有全等的三角形;
(2)选择(1)中的任意一对进行证明.
(1)写出图中所有全等的三角形;
(2)选择(1)中的任意一对进行证明.
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235192142192640/2235895604592641/STEM/50a2b947433742869b14bd87cf9607b4.png?resizew=148)
11-12八年级上·江苏徐州·期中 查看更多[7]
(已下线)2011-2012年江苏省丰县中学八年级上学期期中考试数学卷(已下线)2011-2012学年甘肃省白银五合中学九年级上期末模拟测试数学试卷(已下线)2012届湖北省宜昌市长阳县九年级上学期期末复习数学试卷2013届甘肃省酒泉市瓜州二中九年级上学期期末考试数学试卷人教版八年级数学下册 第十八章 平行四边形单元测验卷陕西省宝鸡市扶风县2017-2018学年下期八年级期末数学试题四川省达州市渠县2020-2021学年八年级下学期期末数学试题
更新时间:2016-12-05 06:19:12
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解答题-作图题
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【推荐1】如图,分别以线段
的两个端点为圆心,大于
的长为半径画弧,交于G、H两点,作直线
.已知点C、D在直线
上,
与点E,
与点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/f1ecfb29-0fda-4d41-b6dd-de8403e40c40.png?resizew=183)
(1)根据作图可知,直线
是线段
的___________.
(2)图中有___________对全等三角形(能用字母表示的).
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/f1ecfb29-0fda-4d41-b6dd-de8403e40c40.png?resizew=183)
(1)根据作图可知,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)图中有___________对全等三角形(能用字母表示的).
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
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解答题-证明题
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真题
【推荐2】如图,点A,D,C,F在同一条直线上,AB=DE,BC=EF.有下列三个条件:①AC=DF,②∠ABC=∠DEF,③∠ACB=∠DFE.
(2)利用(1)的结论△ABC≌△DEF.求证:AB∥DE.
(2)利用(1)的结论△ABC≌△DEF.求证:AB∥DE.
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解答题-问答题
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【推荐1】在探索平面图形的性质时,往往需通过剪拼的方式帮助我们寻找解题思路.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/f3cb79ad-fe5a-4bb3-8c77-670580cdc7a9.png?resizew=501)
知识回顾
例如,在证明三角形中位线定理时,可以采用如图(1)的剪拼方式,将三角形转化为平行四边形使问题得以解决.
实践操作
如图(2),在梯形
中,
,
是腰
的中点,请你沿着
将上图的梯形剪开,重新拼成一个完整的三角形,并画出来.(不用剪开,作图即可)
猜想证明
如图(3),在梯形
中,
,
、
分别是两腰
、
的中点,我们把
叫做梯形
的中位线.请类比三角形的中位线的性质,猜想
和
、
有怎样的位置和数量关系?请结合“实践操作”完成猜想的证明.
知识运用
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(1)已知梯形的中位线长为
,高为
,则梯形面积是______
;
(2)直线
为
外的任意一条直线,过
、
、
、
分别作直线
的垂线段
、
、
、
,线段
、
、
、
之间的数量关系为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/f3cb79ad-fe5a-4bb3-8c77-670580cdc7a9.png?resizew=501)
知识回顾
例如,在证明三角形中位线定理时,可以采用如图(1)的剪拼方式,将三角形转化为平行四边形使问题得以解决.
实践操作
如图(2),在梯形
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猜想证明
如图(3),在梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53f982a67cfcd2b66afc59c74a2a73e.png)
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知识运用
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(1)已知梯形的中位线长为
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(2)直线
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解答题-证明题
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【推荐2】如图,
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