如图,在
中,点
是边
的中点,点
在
内,
平分
,
,点F在边AB上,
.
是平行四边形;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7dcbc0a82c2495d16dd1dfcb7bb0e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
22-23八年级上·山东济宁·期末 查看更多[6]
山东省济宁市济宁学院附属中学(五四制)2022-2023学年八年级上学期期末数学试题(已下线)(培优特训)专项18.1 平行四边形综合高分必刷-2022-2023学年八年级数学下册《同步考点解读·专题训练》(人教版)江苏省宿迁市宿豫区玉泉山路初级中学2022-2023学年八年级下学期3月月考数学试题(已下线)第09讲 三角形的中位线(6种题型+强化训练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(苏科版)(已下线)2023—2024学年名校期末好题汇编(人教版八年级数学下册)——专题三—平行四边形和三角形的中位线广东省江门市怡福中学2023-2024学年八年级下学期期末数学试题
更新时间:2023-09-09 20:20:19
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【推荐1】阅读与思考:下面是一位同学的数学学习笔记,请仔细阅读并完成相应任务.
任务:
(1)填空:材料中的依据1是指:_____________.
依据2是指:_____________.
(2)请用刻度尺、三角板等工具,画一个四边形
及它的瓦里尼翁平行四边形
,使得四边形
为矩形;(要求同时画出四边形
的对角线)
(3)在图1中,分别连接
得到图3,请猜想瓦里尼翁平行四边形
的周长与对角线
长度的关系,并证明你的结论.
瓦里尼翁平行四边形 我们知道,如图1,在四边形 ![]() ![]() ![]() ![]() ![]() ![]()
![]() ![]()
②瓦里尼翁平行四边形的周长与原四边形对角线的长度也有一定关系. ③瓦里尼翁平行四边形的面积等于原四边形面积的一半.此结论可借助图1证明如下: 证明:如图2,连接 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ∵ ![]() ![]() ![]()
![]() ![]() ![]() ∵四边形 ![]() ![]() ![]() ∵ ![]() ![]() ∴四边形 ![]() ![]() ∵ ![]() ![]() |
(1)填空:材料中的依据1是指:_____________.
依据2是指:_____________.
(2)请用刻度尺、三角板等工具,画一个四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)在图1中,分别连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
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【推荐2】如图.在一次数学研究性学习中,小华将两个全等的直角三角形纸片
和
拼在一起,使点
与点
重合,点
与点
重合(如图),其中
,发现四边形
是平行四边形.如图,小华继续将图中的纸片
沿
方向平移,连结
,
,当点
与点
重合时停止平移.
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708230555836416/2710746607321088/STEM/3249b32e-9aaf-4c10-b8c5-597cb0cd3a2d.png)
(1)请问:四边形
是平行四边形吗?说明理由.
(2)如图,若
,
,当
时,请判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5d835ca247252e4903af22789b5f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a569bb4a99615a33360e5f352bff2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5d835ca247252e4903af22789b5f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708230555836416/2710746607321088/STEM/3249b32e-9aaf-4c10-b8c5-597cb0cd3a2d.png)
(1)请问:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
(2)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11230e51fc1e38e9f542edb2b6fa178c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be037e8cff1638ab4f8441e4c425bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fae515c44f52c0a715a87d626dc8258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
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【推荐1】已知矩形
中,点
为
上一点.连接
、
,
的平分线与
交于点
,
垂直平分
,连接
.
(1)如图1,
①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9c59463fdce9259f60b935164dd00e.png)
;
②若
,
,求
的面积;
(2)如图2,若
,
是
的中点,连接
,判断四边形
的形状,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
(1)如图1,
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9c59463fdce9259f60b935164dd00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61601ecf8de47ed9b84ee59d65f8118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6697f92f42bf3ded6b5a13dd703fe032.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf26ce298c75a551d337346674aea970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0db8aa37b6e877dcf19342e245d4fbe.png)
![](https://img.xkw.com/dksih/QBM/2021/7/2/2755492956545024/2773992882053120/STEM/ead7ce74-8476-4340-b7bc-d890aacbdc60.png)
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【推荐2】已知:如图AB=AC,AB⊥AC,AD=AE,AD⊥AE,点M为CD的中点
求证:2AM=BE
求证:2AM=BE
![](https://img.xkw.com/dksih/QBM/2021/1/3/2628043219984384/2633108083228672/STEM/8d1e7734-200d-4744-bc21-8b178f4dbde4.png)
您最近一年使用:0次