1 . (1)回归课本
请用文字语言表述三角形的中位线定理:________________.
(2)回顾证法
证明三角形中位线定理的方法很多,但多数都要通过添加辅助线构图完成.下面是其中一种辅助线的添加方法.请结合图2,补全求证及证明过程.
已知:在
中,点
分别是
的中点.
求证:________________.
证明:过点
作
,与
的延长线交于点
.
(3)实践应用
如图3,点
和点
被池塘隔开,在
外选一点
,连接
,分别取
的中点
,测得
的长度为9米,则
两点间的距离为________________.
请用文字语言表述三角形的中位线定理:________________.
(2)回顾证法
证明三角形中位线定理的方法很多,但多数都要通过添加辅助线构图完成.下面是其中一种辅助线的添加方法.请结合图2,补全求证及证明过程.
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
求证:________________.
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b00a5239269d72d6f9632e7d77347106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)实践应用
如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
您最近一年使用:0次
2023-07-04更新
|
207次组卷
|
6卷引用:第23章 图形的相似 23.4 中位线华东师大版(2012)九年级上册课后作业
第23章 图形的相似 23.4 中位线华东师大版(2012)九年级上册课后作业河南省三门峡市灵宝市2022-2023学年八年级下学期期末数学试题(已下线)专题18.7 三角形的中位线(知识梳理与考点分类讲解)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)湖南省永州市道县2023-2024学年八年级下学期月考数学试题(已下线)八年级数学期末必刷题02(常考题,58题22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)(已下线)专题09 三角形的中位线与多边形的内角和、外角和(9大题型+优选提升题)-备战2023-2024学年八年级数学下学期期末真题分类汇编(北师大版)
22-23八年级下·全国·课后作业
2 . 如图1,正方形
中,E、F分别是
上的点,且满足
,连接
,交点为O,
![](https://img.xkw.com/dksih/QBM/2023/4/5/3209831408803840/3217012301438976/STEM/f970f711d6634bcda11ec7e5e34fcb41.png?resizew=267)
(1)请判断
与
的关系,并证明你的结论.
(2)如图2,连接BE、EF,若G、H、P、Q分别是
的中点,试说明四边形
是正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64dde15423371c3d9289f97efbcd36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec00b62106276a663960c688e0a22f76.png)
![](https://img.xkw.com/dksih/QBM/2023/4/5/3209831408803840/3217012301438976/STEM/f970f711d6634bcda11ec7e5e34fcb41.png?resizew=267)
(1)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)如图2,连接BE、EF,若G、H、P、Q分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c5a5d3234cd00942464dd2cb7f5974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b92a95f86be61b826727d2bfef9dc1.png)
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3 . 如图,四边形
是矩形,点
是
延长线一点,连接
,
垂直平分
,垂足为
,点
在
上,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/1d513862-d5e2-4b7b-bfb5-e799be722d5f.png?resizew=147)
(1)若
,
,求
;
(2)若
,求证:
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bcd26bc9e85cdae1a06ecd1a65643f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/1d513862-d5e2-4b7b-bfb5-e799be722d5f.png?resizew=147)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766b51dbdec21ce16d595c0594dcf219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd495843817029d40bd4064f738a332f.png)
您最近一年使用:0次
2023-04-09更新
|
188次组卷
|
2卷引用:第23章 图形的相似 23.4 中位线华东师大版(2012)九年级上册课后作业
4 . 如图1,
中,
,点
为
中点,点
为
上一点,连结
.已知
.动点
从点
出发,以1个单位/秒的速度沿线段
向终点
运动,设点
运动的时间为
(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/5e1a9f16-0397-4491-afaf-123bf98df6a3.png?resizew=168)
(1)求证:
.
(2)若
为等腰三角形时,求
的值.
(3)如图2,动点
出发的同时,另有一点
从点
出发沿线段
向终点
运动,速度为
个单位/秒,连结
,将线段
绕点
分别向顺时针和逆时针方向旋转
,得到线段
和
,当
三点共线时,直接写出
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/fb0bd5b257249110729596fa444a5bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/86498dee-61ea-4600-8545-d217dde62d38.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/5e1a9f16-0397-4491-afaf-123bf98df6a3.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71a79fb92a4337e8e54d94e85dd9354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc837376ea4bc4d84325174b041770f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc837376ea4bc4d84325174b041770f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c145957fbd3fe95afceb16ad9e6744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2023-02-11更新
|
670次组卷
|
7卷引用:专题 18.60 平行四边形(全章复习与巩固)(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(人教版)
(已下线)专题 18.60 平行四边形(全章复习与巩固)(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(人教版)(已下线)专题18.56 平行四边形动点问题(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(人教版)浙江省温州市实验中学2022-2023学年八年级上学期期中数学试题(已下线)第4章 平行四边形 章末重难点检测卷-【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)浙江八年级下期中真题精选(压轴60题专练)-【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(浙教版)(已下线)核心考点03平行四边形-【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(浙教版)(已下线)专题5.31 平行四边形动点问题(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(浙教版)
21-22八年级下·全国·课后作业
5 . 已知矩形的周长为
,对角线的交点到短边的距离比到长边的距离大4.求矩形的各边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b36fb43923326b42462c2b53c52c372.png)
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21-22八年级下·全国·课后作业
6 . 一块铁皮零料的形状如图所示,要从中裁出一块平行四边形铁皮,并使四个顶点分别落在原铁皮零料的四条边上.可以怎样裁?
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119301061959680/3119525098250240/STEM/161c65f60b1140cd968c839b6d8dafd0.png?resizew=117)
您最近一年使用:0次
21-22八年级下·全国·课后作业
7 . 取任意一张三角形纸片,你能把它剪成四个全等的三角形吗?说明你的方法,并画出示意图.
您最近一年使用:0次
21-22八年级下·全国·课后作业
8 . 任意作一个三角形,然后作出它的三条中位线.
您最近一年使用:0次
名校
9 . 在
中,
,D为
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/1152a1ea-fd54-42d8-8a15-23ef0ce141e7.png?resizew=575)
(1)如图1,当
时,若
,求
的长;
(2)如图2,当
时,点P为
的中点,且
,求证:
;
(3)如图3,在(2)的条件下,将
绕点P旋转
,得到
,连接
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/1152a1ea-fd54-42d8-8a15-23ef0ce141e7.png?resizew=575)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6964b99181d039fe8c5ed5fe2bb00f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e219b4b74587a077f223fec499bace9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f11756f5af0aba84859943fa7a0bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b41a9b6fd2dd637e4c540e2b8e8a62a.png)
(3)如图3,在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842341a54ceb38a2dc0b3627a40e1169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288abe01824f42cfe725509af5aec4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e96f7c4f39b033f14b9b0a8cb08758.png)
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名校
10 . 如图1,直线
和直线
相交于A点
,B、C分别在y轴的正半轴和负半轴上,且
,C点坐标为
.
的函数表达式;
(2)在线段
上找一点P,使得
,求P点的坐标;
(3)如图2,D点为线段
的中点,若点Q是线段
(不与点A、B重合)上一点,且使得
,请求出Q点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3983b5b55fb3bd72960e0ee1e4e1365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803dc3c76fd2b51696647aa18602412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5efbcec6e539d53a1685a3f373c851be.png)
(3)如图2,D点为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9753ceaeeedb95f89accdf2fafbe5155.png)
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2022-11-13更新
|
445次组卷
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8卷引用:专题9.27 三角形的中位线(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)
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