名校
1 . 在学习《圆》这一单元时,我们学习了圆周角定理的推论:圆内接四边形的对角互补;事实上,它的逆命题:对角互补的四边形的四个顶点共圆,也是一个真命题.在图形旋转的综合题中经常会出现对角互补的四边形,那么,我们就可以借助“对角互补的四边形的四个顶点共圆”,然后借助圆的相关知识来解决问题,例如:已知:
是等边三角形,点D是
内一点,连接
,将线段
绕C逆时针旋转
得到线段
,连接
,
,
,并延长
交
于点F.当点D在如图所示的位置时:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/4f413932-922d-4857-9243-5a9c48f3d7da.jpg?resizew=140)
(1)观察填空:与
全等的三角形是______;
(2)利用(1)中的结论,求
的度数
(3)判断线段
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/4f413932-922d-4857-9243-5a9c48f3d7da.jpg?resizew=140)
(1)观察填空:与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)利用(1)中的结论,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(3)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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2023-05-20更新
|
217次组卷
|
6卷引用:2023年广东省湛江市经济技术开发区中考二模数学试卷
名校
解题方法
2 . 课堂上,老师提出了这样一个问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/30721da2-97e1-4663-8006-dd6b34e3ca4d.png?resizew=404)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/3204a237-89b7-4f5b-b193-99207d69483e.png?resizew=405)
如图1,在
中,
平分
交
于点D,且
,求证:
,小明的方法是:如图2,在
上截取
,使
,连接
,构造全等三角形来证明.
(1)小天提出,如果把小明的方法叫做“截长法”,那么还可以用“补短法”通过延长线段
构造全等三角形进行证明.辅助线的画法是:延长
至F,使
=______,连接
请补全小天提出的辅助线的画法,并在图1中画出相应的辅助线;
(2)小芸通过探究,将老师所给的问题做了进一步的拓展,给同学们提出了如下的问题:
如图3,点D在
的内部,
分别平分
,且
.求证:
.请你解答小芸提出的这个问题(书写证明过程);
(3)小东将老师所给问题中的一个条件和结论进行交换,得到的命题如下:
如果在
中,
,点D在边
上,
,那么
平分
小东判断这个命题也是真命题,老师说小东的判断是正确的.请你利用图4对这个命题进行证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/30721da2-97e1-4663-8006-dd6b34e3ca4d.png?resizew=404)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/3204a237-89b7-4f5b-b193-99207d69483e.png?resizew=405)
如图1,在
![](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/729f26114f36d79bc39470dc5416613b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd782bf9f92f718be65ec8cc5960eff6.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/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)小天提出,如果把小明的方法叫做“截长法”,那么还可以用“补短法”通过延长线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)小芸通过探究,将老师所给的问题做了进一步的拓展,给同学们提出了如下的问题:
如图3,点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8593a9875a1e7cf4012d7bf872b5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bd9a5cf6ae227b55ee2166cf04ae1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadd3c95bb3463718705a748b264ba3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd7f98c175f2b11c58e2ac6a2dc74be.png)
(3)小东将老师所给问题中的一个条件和结论进行交换,得到的命题如下:
如果在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd782bf9f92f718be65ec8cc5960eff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729f26114f36d79bc39470dc5416613b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
您最近一年使用:0次
2022-11-08更新
|
1032次组卷
|
14卷引用:2023年广东省湛江市霞山区乐群学校中考一模数学试题
2023年广东省湛江市霞山区乐群学校中考一模数学试题2023年广东省肇庆市怀集县幸福街道初级中学中考一模数学试题(已下线)2023年广州等市一模(几何综合)(已下线)2023年中山等市一模(几何综合1)北京市西城区2020-2021学年八年级上学期期末数学试题北京市西城区2020-2021学年初中八年级上学期期末数学试卷北京市八一学校2021-2022学年八年级上学期期中数学试题河南省信阳市淮滨县2021-2022学年八年级上学期期末数学试题北京市朝阳外国语学校2022-2023学年八年级上学期期中考试数学试卷河南省南阳市宛城区实验中学2022-2023学年八年级上学期第二次月考数学试题(已下线)重难点03全等三角形中“截长补短”模型-【暑假自学课】2023年新八年级数学暑假精品课(苏科版)(已下线)专题04 全等三角形模型训练(6类经典模型+优选提升)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(人教版)河南省南阳市2023-2024学年八年级上学期期中数学试题河南省南阳市宛城区2023-2024学年八年级上学期期中数学试题
3 . 如图,
和
是两个全等的等腰直角三角形,其中斜边
的端点D在斜边
的延长线上,
相交于点F,则以下判断不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/40d81ecb-e31a-4fa9-9578-7d6ed75d80f7.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4320b5bb88f112357bf2700e1924ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/40d81ecb-e31a-4fa9-9578-7d6ed75d80f7.png?resizew=189)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
4 . 阅读下面材料,完成相应的任务:
(1)小明在研究命题①时,在图1的正方形网格中画出两个符合条件的四边形.由此判断命题①是____命题(填“真”或“假”);
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449975471120384/2453451778916352/STEM/e872d0ad16cd4c83a0dae27c3dceeb67.png?resizew=188)
(2)小彬经过探究发现命题②是真命题,请你结合图2证明这一命题;
(3)小颖经过探究又提出了一个新的命题:“若
,
,
,______,_____,则四边形
四边形
,请在横线上填写两个关于“角”的条件,使该命题为真命题.
全等四边形 能够完全重合的两个四边形叫做全等四边形.由此可知,全等四边形的对应边相等、对应角相等;反之,四条边分别相等、四个角也分别相等的两个四边形全等.在两个四边形中,我们把“一条边对应相等”或“一个角对应相等”称为一个条件.根据探究三角形全等条件的经验容易发现,满足1个、2个、3个、4个条件时,两个四边形不一定全等. 在探究“满足5个条件的四边形 ![]() ![]() ①若 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ②若 ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
(1)小明在研究命题①时,在图1的正方形网格中画出两个符合条件的四边形.由此判断命题①是____命题(填“真”或“假”);
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449975471120384/2453451778916352/STEM/e872d0ad16cd4c83a0dae27c3dceeb67.png?resizew=188)
(2)小彬经过探究发现命题②是真命题,请你结合图2证明这一命题;
(3)小颖经过探究又提出了一个新的命题:“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e117b368e8495c7835e3878233068fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8c6e61bd887fcc69fc2ccd5e57ab03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063be481ae445e25b5b98fb3870efd16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef82ace37652c02cf6769a3c70e6890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449975471120384/2453451778916352/STEM/33d164489ba64856adf80171ef3b7bc7.png?resizew=174)
您最近一年使用:0次
5 . 【定义学习】
定义:如果四边形有一组对角为直角,那么我们称这样的四边形为“对直四边形”.
【判断尝试】
(1)在①平行四边形②矩形③菱形④正方形中,是“对直四边形”的是______ ;(填序号)
(2)如图
,四边形
是对直四边形,若
,
,
,
,则边
的长是______ ;
【操作探究】
如图
,在菱形
中,
,
,
于点
,请在边
上找一点
,使得以点
、
、
、
组成的四边形为“对直四边形”,画出示意图,并直接写出
的长是______ ;
【拓展延伸】
如图
,在正方形
中,
,点
、
、
分别从点
、
、
同时出发,并分别以每秒
、
、
个单位长度的速度,分别沿正方形的边
、
、
方向运动
保持
,再分别过点
、
作
、
的垂线交于点
,连接
、
.
(1)试说明:四边形
为对直四边形.
(2)在此运动过程中,动点
的运动路径长是______ ;
【实践应用】
某加工厂有一批四边形板材,形状如图
所示,其中
米,
米,
,
现根据客户要求,需将每张四边形板材进一步分割成两个等腰三角形板材和一个“对直四边形”板材,且这两个等腰三角形的腰长相等,要求材料充分利用无剩余
请直接写出分割后得到的等腰三角形的腰长是______ .
定义:如果四边形有一组对角为直角,那么我们称这样的四边形为“对直四边形”.
【判断尝试】
(1)在①平行四边形②矩形③菱形④正方形中,是“对直四边形”的是______ ;(填序号)
(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/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【操作探究】
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【拓展延伸】
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680e527a4871a37095efa96ea06ed564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
(1)试说明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205e16bad4685e3d9f6628e89059f657.png)
(2)在此运动过程中,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
【实践应用】
某加工厂有一批四边形板材,形状如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96989035edd11b3a724436b195057862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/d0f61989-411e-4787-8820-33d9c5fc5c1a.png?resizew=365)
您最近一年使用:0次
名校
6 . 如图,在等腰直角
中,
,
,点
是
边上一点(点
不与点
,
重合),连接
,线段
绕点
顺时针旋转
得到线段
,连接
,
,线段
与
边交于点
,有以下说法:
Ⅰ
四边形
的面积总等于
;
Ⅱ
当
时,
的外接圆半径为
.
![](https://img.xkw.com/dksih/QBM/2023/4/30/3227461466628096/3228610196946944/STEM/ce16eaf9e2a14a49aef1dfd9bc97e007.png?resizew=138)
下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
Ⅰ
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b77a750c8b127476bbb41e1eb289750.png)
Ⅱ
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783a833992e0862211a15fec2d3e3dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90feb5b1e8400d75b7cc6676dd0fef7.png)
![](https://img.xkw.com/dksih/QBM/2023/4/30/3227461466628096/3228610196946944/STEM/ce16eaf9e2a14a49aef1dfd9bc97e007.png?resizew=138)
下列判断正确的是( )
A.两种说法都正确 | B.说法Ⅰ正确,说法Ⅱ不正确 |
C.说法Ⅰ不正确,说法Ⅱ正确 | D.两种说法都不正确 |
您最近一年使用:0次
7 . 如图,在四边形
中,
,点
为对角线
上的两点,且
,
.连接
.
(1)求证:
;
(2)从下列条件中任选一个作为已知条件后,试判断四边形
的形状,并证明你的结论.选择的条件:______(填写序号).(注:如果选择①,②分别进行解答,按第一个解答计分)
①
,②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac01997ed773445b3677b44e98bc05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a88ce951040633269ec0f78706a270.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/0608763c-b02a-49da-8df6-1798b0f9f0bd.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)从下列条件中任选一个作为已知条件后,试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecb138a844ef11bb3214cff0a475c9b.png)
您最近一年使用:0次
2023-05-15更新
|
318次组卷
|
4卷引用:2023年山东省青岛市西海岸新区中考二模数学试题
2023年山东省青岛市西海岸新区中考二模数学试题2023年山东省青岛市李沧区中考二模数学试题(已下线)2023湖南省岳阳市中考数学变式题21-24题(已下线)综合复习与测试(3)(期末模拟测试卷)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)
8 . 在综合与实践课上,刘老师展示了一个情境,让同学们进行探究:
情境呈现:
如图1,等腰直角三角形
中,
,
,点P为
上一点,过点P作
,垂足为Q,连接
,点D为
的中点,连接
,
.
特殊分析:
绕点A顺时针旋转,当点P落在
上时,如图2,探究
与
的数量关系;
小明同学的分析如下:
填空:
①小明判断
的依据是______(填序号);
A.
B.
C.
D.
E.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
②请判断
的度数为______;
一般研讨:
(2)若将
绕点A在平面内顺时针旋转,如图3,
与
的数量关系是否发生变化?若变化,请说明理由;若不变化,请证明;
拓展延伸:
(3)若
,
,在
绕点A旋转的过程中,当
时,请直接写出线段
的长.
情境呈现:
如图1,等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
特殊分析:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.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/3525ddc5153fada64eaf14e50b536542.png)
小明同学的分析如下:
分别过点Q,C作![]() ![]() ∵ ![]() ![]() ![]() ![]() ∴ ![]() ![]() ![]() ∵点D是 ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
①小明判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d72e41a170758a2ef527a8b9174d690.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d885ccc243d7f2cebb47dcd77681ccd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4351a730f61bb998bab8f0b7848912d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
②请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b6edc361583a9fb853b5755a07cd2.png)
一般研讨:
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
拓展延伸:
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6758569a2f3b098253dedf7c575be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2202d9071a4a53bb61b1237269e537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79d42ca9316de7be10d095b5b9dc9748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb151bf3043b8a816660e9beb9e0c5b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
您最近一年使用:0次
2023-04-26更新
|
228次组卷
|
4卷引用:2023年河南省商丘市柘城县中考一模数学试题
2023年河南省商丘市柘城县中考一模数学试题(已下线)2023年河南省一模(几何综合2)2023年河南省南阳市唐河县四校联考中考模拟数学模拟试题(三)2024年辽宁省初中学业水平训练卷(三) 数学模拟预测题
9 . 如图,在
中,
,
相交于点
,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/788475e0-a87a-4a69-b950-ed262d73c802.png?resizew=237)
(1)求证:
;
(2)连接
,
,已知_______(从以下两个条件中任选一个作为已知,填写序号),请判断四边形
的形状,并证明你的结论.
条件①:
;
条件②:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/788475e0-a87a-4a69-b950-ed262d73c802.png?resizew=237)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)连接
![](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/6f3c15b30bd155641e548a7d8c172dd4.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889ea7e7e18fee2eb0d5fb80d394be35.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
您最近一年使用:0次
2023-01-06更新
|
242次组卷
|
3卷引用:山东省青岛市胶州市2022-2023学年九年级上学期期中数学试题
名校
10 . 如图,在
中,
相交于点O,E,F分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106793439010816/3107944452407296/STEM/bd0c432fda3f4e19ad179f30af3e5f82.png?resizew=211)
(1)求证:
;
(2)连接
,已知____(从以下两个条件中任选一个作为已知,填写序号),请判断四边形
的形状,并证明你的结论.
条件①:
;
条件②:
.
(注:如果选择条件①条件②分别进行解容,按第一个解答计分)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106793439010816/3107944452407296/STEM/bd0c432fda3f4e19ad179f30af3e5f82.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19097651607095bc2bf9298bb964c392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889ea7e7e18fee2eb0d5fb80d394be35.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
(注:如果选择条件①条件②分别进行解容,按第一个解答计分)
您最近一年使用:0次
2022-11-12更新
|
160次组卷
|
2卷引用:山东省青岛市黄岛区、胶州市、平度市、西海岸新区2022-2023学年九年级上学期期中数学试题