已知四边形
是
的角平分线,交射线
于E,线段
的延长线上取一点F使
,直线
交于点G.
(2)猜想
的形状,并证明你的猜想;
(3)求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbc5d8c39ce0de4d03c161a27691a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5456118af546e40d9c06c802fc6fda.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
2022·北京西城·模拟预测 查看更多[8]
2022年北京市西城区三帆中学中考数学模拟试卷(已下线)专题9.11 平行四边形(培优篇)(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)专题9.28 中心对称图形——平行四边形(全章复习与巩固)(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)2022年北京市三帆中学中考模拟数学试题2024年北京市人大附中经开学校中考模拟数学试题北京市人大附中北京经济技术开发区学校2023-2024学年中考模拟数学试题(已下线)2024年北京市石景山区中考二模数学试题(已下线)专题6.13 平行四边形(全章分层练习)(培优练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2024-06-02 11:42:30
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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,四边形ABCD中,AD=CD,AB=CB. 我们把这种两组邻边分别相等的四边形叫做筝形.AC,BD 是筝形的对角线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/93059567-9ddc-404a-9e5b-f97d3fee5a20.png?resizew=163)
(1)下列结论正确的是 (填序号).
①∠DAB=∠DCB;
②∠ABC=∠ADC;
③BD 平分∠ABC;
④BD 垂真平分 AC.
(2)从(1)中选择一个正确的结论,并证明;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/93059567-9ddc-404a-9e5b-f97d3fee5a20.png?resizew=163)
(1)下列结论正确的是 (填序号).
①∠DAB=∠DCB;
②∠ABC=∠ADC;
③BD 平分∠ABC;
④BD 垂真平分 AC.
(2)从(1)中选择一个正确的结论,并证明;
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【推荐2】如图所示,已知点A,C,B,D在同一条直线上,AC=BD,AM=CN,BM=DN,试说明AM∥CN,BM∥DN.
![](https://img.xkw.com/dksih/QBM/2018/2/28/1891972586913792/1897262852874240/STEM/ae50c1c7-798c-4af7-aa39-48dde2a0a9b7.png?resizew=155)
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【推荐1】如图,矩形
的对角线
相交于点O,点E,F在
相上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/e95c4528-8b87-4c3d-adbf-38e38b29c0fa.png?resizew=180)
(1)求证:
;
(2)若
,求矩形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/e95c4528-8b87-4c3d-adbf-38e38b29c0fa.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)若
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【推荐2】将两个大小不一的等腰直角三角板如图①放置,图②是由它抽象出的几何图形,
、
、
三点在同一直线上,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/cd0f1b9f-0ce0-40da-be5d-8364d15c4a84.png?resizew=385)
(1)请找出图②中的全等三角形,并说明理由.
(2)试问:
与
的位置关系如何?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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(1)请找出图②中的全等三角形,并说明理由.
(2)试问:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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【推荐1】在等边三角形
中,已知点
在直线
上,点
在直线
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/dc71dae4-cd05-4ca6-b091-e320dc82c381.png?resizew=340)
(1)【特殊情况,探索结论】
如图1,当
为
的中点时,确定线段
与
的大小关系,请你直接写出结论:
___________
(填“>”“<”或“=”).
(2)【特例启发,解答题目】
如图2,当
为
边上任意一点时,猜想线段
与
的数量关系,并说明理由.
(3)【拓展结论,设计新题】
若
的边长为1,
,求
的长(请你画出相应图形,并直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)【特殊情况,探索结论】
如图1,当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(2)【特例启发,解答题目】
如图2,当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(3)【拓展结论,设计新题】
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
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【推荐2】如图l,已知
ABC和
EFC都是等边三角形,且点E在线段AB上.
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(1)过点E作EG
BC交AC于点G,试判断
AEG的形状并说明理由;
(2)求证:BF
AC;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/2f928143-3aff-4e80-b3ed-828bca1bfaa2.png?resizew=164)
(1)过点E作EG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7003aee0b4b85f0fdd48ca9ae5826d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db999650f7f40ac6aaf3ff856ea4ca40.png)
(2)求证:BF
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名校
【推荐1】如图所示,在△ABC中,∠ACB=90°点E是AB的中点,连接CE,过点E作ED⊥BC于点D,在DE的延长线上取一点F,使AF=CE,求证四边形ACEF是平行四边形.
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适中
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【推荐2】如图,点
是平行四边形
对角线的交点,过点
的直线交
于
两点,交
,
的延长线于
两点.
;
(2)连接
,求证:四边形
是平行四边形.
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(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55261d51952f7afdf5f50a06d50e32e.png)
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