名校
1 . 如图,在
中,
,
.
于点
.以
为边作等边
,直线
交直线
于点
.连接
交
于
.
(1)求证:
:
(2)探索
,
,
之间的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6456245b58e20ebc06e8eba9bbff4b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](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/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/93f1d2aa-3c7a-43a4-8bf4-64a763d04849.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a36f5dfc85b947863ecb4bb6e246825.png)
(2)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
您最近一年使用:0次
2 . 已知点
是平面直角坐标系中一点,且
.点
是平面内一动点,
是以
为斜边的等腰直角三角形(点A、B、C逆时针排列).
(2)如图1,当点B位于x轴正半轴上时,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ff26eeabfaef6e944082999e39e814.png)
(3)如图2,点B在第二象限内运动,
,
,
轴于点H,点G是
的中点.现在给出两个结论:①
为定值;②
的大小为定值,其中有且只有一个是正确的,请找出正确的结论并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaf2376756ba3db783d1fc35a933f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeebe2d626de76ae34a1a42b62a1a3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图1,当点B位于x轴正半轴上时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ff26eeabfaef6e944082999e39e814.png)
(3)如图2,点B在第二象限内运动,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7215cf9e5b987d5c15cf3b70bdb03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa2939c8522b09bad3607c086047919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7277dcfb480720f2f37413cb0d34d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a375f0489b083f97c95f1dd4e4de455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3465d6a76a5991ff3d9232736de7c822.png)
您最近一年使用:0次
3 . 在矩形
中,
,
,点 Q 在线段
上,点 P 在线段
上,且
,连接
,过点 P 作
,
与边
相交于点 E,与边
相交于点 F,连接
.
(1)求线段
的长
(2)求证:
;
(3)试探究线段
,
,
三者之间的等量关系, 并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](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/574dc284fb9e74d65cf0c79a978d65de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65972bd0841751acde36d426dd46ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/a60d9f80-fae1-462e-a17a-acf1ba14df08.png?resizew=164)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
(3)试探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
2023-08-02更新
|
91次组卷
|
2卷引用:湖南省岳阳市平江县2022-2023学年八年级下学期期末数学试题
22-23八年级上·广东汕头·期中
名校
4 . 如图,在
中,
,
,
是
边上的中线,
的垂直平分线
交
于点E,交
于点F,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/02dbca44-c6cd-4b8e-aad8-09d5a30dbc31.png?resizew=208)
(1)求证:
;
(2)判断
的形状,并加以证明;
(3)若
,求
边的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03cc9c1600db3a5653e5903db8286e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3fb4e663e01f22d2da0c529ff775614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c79343676784d53f4a432178dcbe09fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/02dbca44-c6cd-4b8e-aad8-09d5a30dbc31.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f48cd68e996379cbb1796a3852e18b.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad0f3d157b67538b473e549a27dc025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
2023-11-07更新
|
186次组卷
|
6卷引用:广东省汕头市潮阳实验学校2022-2023学年八年级上学期期中试题
(已下线)广东省汕头市潮阳实验学校2022-2023学年八年级上学期期中试题 青海省西宁市湟中区新华联北外附属外国语初级中学2022-2023学年八年级上学期期末数学试题广东省广州市黄埔广附教育集团2023-2024学年八年级上学期联考数学试题广东省广州市黄埔区广大附中黄埔实验学校2023-2024学年八年级上学期期中数学试卷安徽省淮南市龙湖中学2023-2024学年八年级上学期期中数学试题(已下线)专题06 等腰、等边三角形与全等三角形综合问题之六大题型-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(人教版)
5 . 如图,
是直角三角形,
,
.
绕着点
顺时针旋转
得到
,且点
的对应点为
,请在图中用尺规作图的方法作出
;(保留作图痕迹,不写作法与证明)
(2)在(1)的条件下,设
与
相交于点
,
与
相交于点
,设
与
相交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9666188e21ea5c4b24d5248e87dc7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b398c95494eddc79939f16e66cf4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25bf4852e15c38c5e4570fc64c96a312.png)
您最近一年使用:0次
6 . 综合与探究
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/83e01e56-6b13-43cb-999a-098bbdc1d5ae.png?resizew=610)
数学兴趣小组活动中,张老师提出了如下问题:如图1,在
中,
,求
边上的中线
的取值范围.
小明在组内经过合作交流,得到了如下的解决方法(如图2).
①延长
到点
,使得
;
②连接
,通过三角形全等把
转化在
中;
③利用三角形的三边关系可得
的取值范围为
,从而得到
的取值范围.
方法总结:上述方法我们称为“倍长中线法”.“倍长中线法”多用于构造全等三角形和证明各边之间的关系.
(1)根据小明组内的做法,能得到
的依据是_______,
边上的中线
的取值范围是_______.
(2)灵活运用:如图3,在
中,
是
的中点,点
在
边上,点
在
边上,若
,求证:
.
(3)拓展延伸:以
的边
为边向外作
和
,
是
的中点,连接
.当
时,请直接写出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/83e01e56-6b13-43cb-999a-098bbdc1d5ae.png?resizew=610)
数学兴趣小组活动中,张老师提出了如下问题:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2664e0c44eaa5487cd8b99772f68a80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
小明在组内经过合作交流,得到了如下的解决方法(如图2).
①延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcb7dd920a799716b5e5febbe4954d6.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5690cfcbb8a0b6da61bf64f1026be443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
③利用三角形的三边关系可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9daa99b481401c3dd6581a07dd6d17ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
方法总结:上述方法我们称为“倍长中线法”.“倍长中线法”多用于构造全等三角形和证明各边之间的关系.
(1)根据小明组内的做法,能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8454c9cb0bc6f224d265a1736a26dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)灵活运用:如图3,在
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47f2874795e9df280e3e0bec171358e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e17c1c2b2b0a45b267e3a33d169737e.png)
(3)拓展延伸:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3467fbd936eee89194c1afcc74eda1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037ac3db1e176432acd190b891eb9d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3fb0e69e5f9f6eba8e35d629d118b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3432d20e661779ddcefda76afcc2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
2023-11-03更新
|
96次组卷
|
2卷引用:河南省新乡市封丘县城关乡中心学校2022-2023学年八年级上学期期中数学试题
7 . 在证明:“线段垂直平分线上的点与这条线段两个端点的距离相等”时,小明给出了如下过程:
则下列说法正确的是( )
已知:如图,直线![]() ![]() ![]() ![]() ![]() 求证: ![]() 证明: ![]() ![]() 又 ![]() ![]() ![]() |
A.①表示互余的定义 | B.②表示![]() | C.②表示![]() | D.①表示垂直的定义 |
您最近一年使用:0次
8 . 阅读下列材料,并完成任务.
三角形的外心
定义:三角形三边的垂直平分线相交于一点,这个点叫做三角形的外心.
如图1,直线
,
,
分别是边
,
,
的垂直平分线.
求证:直线
,
,
相交于一点.
证明:如图2,设
,
相交于点
,分别连接
,
,
.
∵
是
的垂直平分线,
∴
,(依据1)
∵
是
的垂直平分线,
∴
,
∴
,(依据2)
∵
是
的垂直平分线,
∴点
在
上,(依据3)
∴直线
,
,
相交于一点.
(1)上述证明过程中的“依据1”“依据3”分别指什么?
(2)如图3,直线
,
分别是
,
的垂直平分线,直线
,
相交于点
,点
是
的外心,
交
于点
,
交
于点
,分别连接
,
,
,
,
.若
,
的周长为
,求
的周长.
三角形的外心
定义:三角形三边的垂直平分线相交于一点,这个点叫做三角形的外心.
如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
证明:如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/4d86bee8-8c3a-4eef-8f7c-550eb52ecc18.png?resizew=486)
(1)上述证明过程中的“依据1”“依据3”分别指什么?
(2)如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1575126c29c6ea9b4915794f7a3144eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a79fa14c8f71cdd5af3ba00ac5824a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
您最近一年使用:0次
9 . 如图,在
中,
平分
交
于D,
交
于E,过E作
,垂足为H,并交
延长线于F.
;
(2)请猜想
与
的大小关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
(2)请猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db0641078052bf1af17b4c5a01b9ccc.png)
您最近一年使用:0次
10 . 求证:对角线互相垂直的平行四边形是菱形.
下面是嘉嘉的做法:
已知:平行四边形
的对角线
互相垂直,垂足为
,
求证:______________.
(1)请把“求证”补充完整,并根据题意画出图形;
(2)写出证明过程.
下面是嘉嘉的做法:
已知:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
求证:______________.
(1)请把“求证”补充完整,并根据题意画出图形;
(2)写出证明过程.
您最近一年使用:0次
2023-07-11更新
|
145次组卷
|
2卷引用:河北省保定市顺平县2022-2023学年八年级下学期期末数学试题