1 . 【教材呈现】如图是人教版八年级下册第48页部分内容:
(1)请完成教材的证明;
【结论应用】
(2)如图
,在四边形
中,
,
是对角线
的中点,
是
的中点,
是
的中点.请判断
的形状,并说明理由.
(3)如图2,四边形
中,
,
是
中点,
是
中点,连接
,延长
、
交于点
.若
,求
的度数.
如图,点![]() ![]() ![]() ![]() ![]() ![]() ![]() |
【结论应用】
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
(3)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5becdaaedda069466c992293d7890a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
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20-21八年级下·全国·课后作业
2 . (1)如图,
是等边三角形,过它的三个顶点分别作对边的平行线,得到一个新的
,
是等边三角形吗?你还能找到其他的等边三角形吗?点A,B,C分别是
的中点吗?请证明你的结论.
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833512770625536/2841909402820608/STEM/00ab0606001d40c185f55f27ef0a97da.png?resizew=178)
(2)如果
是等边三角形,点A,B,C分别是
的中点,那么
是等边三角形吗?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fecb4b1e0d916f4bfb5fb467d98bc7e9.png)
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833512770625536/2841909402820608/STEM/00ab0606001d40c185f55f27ef0a97da.png?resizew=178)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fecb4b1e0d916f4bfb5fb467d98bc7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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21-22九年级上·全国·课后作业
3 . 证明:如果四边形两条对角线垂直且相等,那么以它的四边中点为顶点可组成一个正方形.
您最近一年使用:0次
20-21八年级下·全国·课后作业
4 . 如图,在四边形
中,E,F,G,H分别是
的中点.四边形
是平行四边形吗?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdec71240782c05de9a93776f9f8ad2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/618917d4-7b13-46aa-8b3e-03ec4e691d4b.png?resizew=187)
您最近一年使用:0次
5 . 如图,
在
上,
与
均为等边三角形,
分别是
的中点,连接
.求证:
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71979a77ecc9034b865efd9dc885636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28da5162e87a3c5efcc78eff518a30f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63bcef85572a1f7d217f0523a6067057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f3f9f4edf520ce61c8e83a2be394d6.png)
您最近一年使用:0次
2023-12-10更新
|
65次组卷
|
3卷引用:辽宁省葫芦岛市连山区2023-2024学年八年级上学期期中数学试题
辽宁省葫芦岛市连山区2023-2024学年八年级上学期期中数学试题辽宁省抚顺市望花区2023-2024学年八年级上学期期中数学试题(已下线)考题猜想3-2平行四边形(常考,构造中位线解题的五种方法)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)
6 . 在
中,
,
,
分别为
,
的中点,
交
的延长线于点
.当
时,求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12780e6c777453dd8dfc0cca7ff034cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94aca49ac8b16079fc50192912a3f39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/4fbfd833-038b-4896-81b5-971c19b5d2a5.png?resizew=151)
您最近一年使用:0次
7 . 如图,已知菱形
,
为
延长线上一点.且
.
;
(2)如图(2),点
为线段
上一点,连接
,
为
的中点,连接
,
.求证:
;
(3)在(2)的条件下,若
,
,菱形
的面积为
,直接写出
的面积.
![](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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
(2)如图(2),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8632ce6e51a12873312957cef3b04bdb.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165463a723cc26c2d227a1c26f61a651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7dc603317eb90974c75efec9f02b1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
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20-21八年级下·全国·课后作业
8 . 已知:在
中,D,E,F分别是边
的中点.
求证:四边形
的周长等于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746ee1515a178948b04f535705c6f738.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dfa01bffe6f5d08931c75970c16b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d831223c3c4ae2ee718118f97a06d6.png)
您最近一年使用:0次
2021-11-01更新
|
360次组卷
|
5卷引用:【北师大版课时练习】 八年级下册 第六章 平行四边形 3 三角形的中位线
(已下线)【北师大版课时练习】 八年级下册 第六章 平行四边形 3 三角形的中位线(已下线)专题4.5 三角形的中位线-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)(已下线)6.3 三角形的中位线(分层练习)-2022-2023学年八年级数学下册同步精品课堂(北师大版)第五章 平行四边形 3 三角形的中位线鲁教版八年级上册课后作业(已下线)第09讲 三角形的中位线(6大考点+过关检测)-【寒假自学课】2024年八年级数学寒假提升学与练(人教版)
21-22九年级上·全国·课后作业
9 . 已知:如图,在四边形
中,
,点E,F,G,H分别是
,
,
,
的中点.求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://img.xkw.com/dksih/QBM/2021/10/15/2829821761323008/2832242547007488/STEM/a9a0cbc4-0b1c-49f0-a921-791320dbfcb7.png)
您最近一年使用:0次
20-21八年级下·全国·课后作业
10 . 求证:三角形的一条中位线与第三边上的中线互相平分.
您最近一年使用:0次
2021-11-01更新
|
200次组卷
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3卷引用:【北师大版课时练习】 八年级下册 第六章 平行四边形 3 三角形的中位线
(已下线)【北师大版课时练习】 八年级下册 第六章 平行四边形 3 三角形的中位线河南省郑州市经开外国语学校2022-2023学年八年级下学期期末数学试题福建省龙岩市上杭县第四中学等三校2023-2024学年八年级下学期期中数学试题