已知:如图,在四边形
中,
与
不平行,E,F,G,H分别是
的中点.
是平行四边形;
(2)①当
与
满足条件 时,四边形
是菱形,在(1)的基础上此时判定菱形的依据是 .
②当
与
满足什么条件时,四边形
是矩形?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3f2255809107d123e0c5b38b17e919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
(2)①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
21-22八年级下·江苏宿迁·阶段练习 查看更多[9]
(已下线)江苏省宿迁市沭阳县正德中学2021-2022学年八年级下学期第一次月考数学试题(已下线)9.5 三角形的中位线(练习)-2022-2023学年八年级数学下册同步精品课堂(苏科版)(已下线)9.5 三角形的中位线-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(苏科版)(已下线)数学(苏科版A卷)-学易金卷:2022-2023学年八年级下学期期中考前必刷卷(已下线)第9章 中心对称图形——平行四边形(基础、典型、易错、压轴)专项训练-【满分全攻略】2022-2023学年八年级数学下学期核心考点+重难点讲练与测试(苏科版)安徽省芜湖市无为市第三中学2022-2023学年八年级下学期期中数学试题(已下线)2023年山西省中考数学真题变式题19-21题(已下线)考题猜想9-1 中心对称图形-平行四边形(培优+拔尖,12种题型)-2023-2024学年八年级数学下学期期末考点大串讲(苏科版)江苏省宿迁市宿城区新区教学共同体2023-2024学年八年级下学期4月期中数学试题
更新时间:2023-02-19 18:24:30
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解答题-证明题
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名校
【推荐1】已知:平行四边形ABCD,对角线AC,BD相交于点O.E是AD的中点,连接OE并延长至F使得
,连接FD,FC,FC交BD于点G.
![](https://img.xkw.com/dksih/QBM/2021/12/31/2891651018711040/2896935715241984/STEM/e68a49a3-d98d-4816-81d8-f808ffbd4506.png?resizew=254)
(1)求证:四边形FOCD是平行四边形;
(2)当AB与AC的数量关系满足______时,四边形FOCD是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21495ef8c631a522ae6f81f576e1caac.png)
![](https://img.xkw.com/dksih/QBM/2021/12/31/2891651018711040/2896935715241984/STEM/e68a49a3-d98d-4816-81d8-f808ffbd4506.png?resizew=254)
(1)求证:四边形FOCD是平行四边形;
(2)当AB与AC的数量关系满足______时,四边形FOCD是菱形.
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解答题-问答题
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【推荐2】如图,在
中,点D,E,F分别是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/be267ea5-7f63-4e96-a6ea-4a7e88967055.png?resizew=271)
(1)试猜想四边形
的形状,并说明理由.
(2)若
,试判断线段
与
的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febd0130486aea7910897fd19b7f58cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942e6dafcfcbf0682856b9f25178694d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/be267ea5-7f63-4e96-a6ea-4a7e88967055.png?resizew=271)
(1)试猜想四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d92ae441a3776a921b4e1b51ec09e0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5cf9715725d7bab609ce4ed7108e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐1】如图,已知点
分别是
的边
的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521461814501376/2524302010908672/STEM/4215009077c749ea8b9b444ab478ce4d.png?resizew=198)
(1)求证:四边形
是平行四边形;
(2)请连接
,若
平分
试判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deee065ac8feb7ceb08a1cc47e1d48ae.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521461814501376/2524302010908672/STEM/4215009077c749ea8b9b444ab478ce4d.png?resizew=198)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
(2)请连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d6b644b32f70a646ee84c77c965516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
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【推荐1】已知:四边形
是平行四边形,以对角线
为斜边作
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747462328320/2790406423715840/STEM/55122d02-681f-40c3-8498-6b744cbffdb5.png)
求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5de4caed08b5566965c47ddc961145b.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747462328320/2790406423715840/STEM/55122d02-681f-40c3-8498-6b744cbffdb5.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,矩形
的对角线相交于点
,
,
.
为菱形;
(2)若将题目中“矩形
”这一条件改为“菱形
”,其余条件不变,则四边形
的形状为________,请说明理由.
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(2)若将题目中“矩形
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解答题-作图题
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【推荐1】如图是由边长为
的小正方形构成的
的网格,点
,
均在格点上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/c17709a1-69ae-4e34-98a7-a8a0ea1f3c4e.png?resizew=291)
(1)在图
中画出以
为边的菱形
,且点
和点
均在格点上;
(2)在图
中画出以
为对角线的矩形
,且点
和点
均在格点上
画出一个即可
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b2a39eb9f5f708bdd2f1cfb3078af7.png)
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(1)在图
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(2)在图
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【推荐2】如图,矩形
的对角线
、
相交于点
,
,
.
是菱形;
(2)若
,
的长为
,求菱形的对角线
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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