1 . 初中几何学习一般路径为:线——三角形——四边形——多边形,线的学习依据位置关系又分为相交线、平行线.三角形、四边形的学习都是由一般到特殊,从一般三角形、四边形到特殊三角形、四边形,且研究了其特殊性质.学习过程中,同学们发现两个全等的特殊三角形即拼成一个特殊四边形.特殊三角形与特殊四边形之间有很多联系.因此在探究特殊四边形中一些线段之间关系时往往和特殊三角形结合起来.下面是数学翱翔社的同学在课后探究特殊三角形与特殊四边形一些重要线段之间关系的过程:
探究发现
如图1,在
中,
,
,点D在
边的延长线上,以
为边作正方形
(与
在
边同侧),连接
,点G为
的中点,连接
.发现
,
.
证明思路如下:
延长
交
于点H,连接
.证明
,点G为
的中点,即可证明结论.
依据提供思路写出规范的推理过程.
类比猜想
(2)等边三角形与有一个角为
的菱形中的特殊线段之间的关系.
如图2,在等边三角形
中,点D在
边的延长线上,以
为边作菱形
,
(与
在
边同侧),连接
,点G为
的中点,连接
.猜想
的数量关系以及位置关系,并说明理由.
拓展延伸
(3)一般等腰三角形与有一个角和等腰三角形顶角度数相等的菱形中特殊线段之间的关系.
如图3,当
为等腰三角形,
,四边形
为菱形,且
时,其他条件不变,请直接写出
的数量关系.
探究发现
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779c26a41987ef67c2f09812c4f15ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9848ea064400aefb91dd3e5a066e760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaf896af5f5a09da3e50a7964d26ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2f06a21c1b60255379fd27425b6e1b.png)
证明思路如下:
延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54977f2005907cb28a0289f0ea4b1d12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79448c0b5a49eb055bd70c0c4db2fceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3b37020a1975e5133c3971645f2849.png)
依据提供思路写出规范的推理过程.
类比猜想
(2)等边三角形与有一个角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
如图2,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779c26a41987ef67c2f09812c4f15ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dccf06184656f261d47dee4155ee895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9848ea064400aefb91dd3e5a066e760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9848ea064400aefb91dd3e5a066e760.png)
拓展延伸
(3)一般等腰三角形与有一个角和等腰三角形顶角度数相等的菱形中特殊线段之间的关系.
如图3,当
![](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/779c26a41987ef67c2f09812c4f15ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21953d4d150833556b71babaf4bd6a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9848ea064400aefb91dd3e5a066e760.png)
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2 . 【问题发现】
在一次数学探究课上,小明把正方形
和正方形
如图摆放到一起,连接
、
,然后把正方形
绕点C顺时针旋转(如图1).
(1)小明发现,无论如何旋转,线段
和
的数量关系是________;直线
和
位置关系是________;(请你把小明的发现补充完整)
【类比探究】
(2)把正方形
绕点C逆时针旋转到图2位置,请你判断:以上结论是否仍成立?若成立,请给出证明;若不成立,请说明理由;
【拓展应用】
(3)连接
并延长交
于点M(如图3),小明发现线段
与线段
的比值是一个定值,请求出这个定值及
的大小;
(4)已知
,
,在正方形
绕点C旋转的过程中,当点D,E,G在同一条直线上时,
的长度是多少?请直接写出答案.
在一次数学探究课上,小明把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
(1)小明发现,无论如何旋转,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
【类比探究】
(2)把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
【拓展应用】
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071953255f6434eaefeab7176372564.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
3 . 【问题呈现】
和
都是直角三角形,
,
,
,连接
,
,探究
,
的位置关系.
时,直接写出
,
的位置关系: __________;
(2)如图2,当
时,(1)中的结论是否成立?若成立,给出证明;若不成立,说明理由.
【拓展应用】
(3)当
,
,
时,将
绕点C旋转,使A,D,E三点恰好在同一直线上,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99100a3ec33eecf804076f76c905359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4818e07559cd9ec3810dcb4d0cdb6a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060e7930731eddbcfac592b808e9b698.png)
【拓展应用】
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a71a658362bd9faa329c3d9f6e6d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8b709a173120436dac669c74b927d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2024-01-23更新
|
134次组卷
|
3卷引用:湖南省永州市零陵区2023-2024学年九年级上学期期末数学试题
4 . 【问题呈现】
和
都是直角三角形,
,
,
,连接
、
,探究
、
的位置关系.
【问题探究】
(1)如图①,当
时,判断
、
的位置关系,并说明理由.
(2)如图②,当
时,
、
的位置关系为______.
【拓展应用】
(3)当
,
,
时,将
绕点C旋转、使A,D,E三点恰好在同一直线上,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99100a3ec33eecf804076f76c905359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4818e07559cd9ec3810dcb4d0cdb6a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
【问题探究】
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
【拓展应用】
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4590b1db8451f30e1021e68b8359c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a88770433e9897d78d28ccfaab8b506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/617a843d-cc61-479e-b34a-9ea7cac75f7f.png?resizew=791)
您最近一年使用:0次
23-24八年级·全国·假期作业
5 . 数学模型可以用来解决一类问题,是数学应用的基本途径,通过探究图形的变化规律,再结合其他数学知识的内在联系,最终可以获得宝贵的数学经验,并将其运用到更广阔的数学天地.
和
中,
,
,
,连接
,延长
交
于点D.则
与
的数量关系:______,
______
;
(2)类比探究:如图2,在
和
中,
,
,
,连接
,延长
交
于点D.请猜想
与
的数量关系及
的度数,并说明理由;
(3)拓展延伸:如图3,
和
均为等腰直角三角形,
,连接
,且点B,E,F在一条直线上,过点A作
,垂足为点M.请猜想
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/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d0dd547921b8a35acf7b407fac21b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c40e779ed185ceb025be51caca951d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2ee144fbda9152177857f19d5aaede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c40e779ed185ceb025be51caca951d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(3)拓展延伸:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a93128719573a60a1bdcf0ede1116b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c40e779ed185ceb025be51caca951d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396632dba26d326a6b69f0bb7016bd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb474bc80260f3171ffda3be40aa905.png)
您最近一年使用:0次
2024-01-19更新
|
124次组卷
|
5卷引用:2024年中考数学模拟预测题(六)
2024年中考数学模拟预测题(六)江西省南昌市二十八中教育集团青云学校2023-2024学年九年级上学期期末数学试题(已下线)寒假作业13 全等三角形的基本模型(14道经典题型+4道中考真题)-【寒假分层作业】2024年八年级数学寒假培优练(人教版)广东省汕头市龙湖区2023-2024学年八年级上学期期末数学试题江苏省南通市启东市2023-2024学年八年级上学期期末数学试题
6 . 【问题情境】在一次数学活动课上,九年一班同学用形状相同的等腰三角形组合新图形,并尝试编制习题,下面是四个小组的探究情况.
(1)一组:
和
是等腰直角三角形,
.
连接
,构建“手拉手”模型(如图1),得到了
;在此基础上,又利用“蝴蝶型”,如图2的划斜线部分,得到了
.
二组:如图3,
和
是等边三角形,
,连接
的延长线与
相交于点
.猜想也能构建上述两种模型得到结论
.
请你模仿一组同学的思路,证明二组同学猜想的结论;
【类比分析】
(2)三组:如图4,在
和
中,
,连接
.
则
与
的数量关系为_______,直线
与直线
的夹角为_______;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/d694f5c9-3980-4b07-94bc-797de8483c45.png?resizew=541)
【变式拓展】
(3)四组:只需用
,就能构建上面任一图形.请你结合图4,用一句话解释这一过程_______;
(4)四组:如图5,
和
是等腰直角三角形,
,
,连接
是线段
的中点,连接
.若
,请你求出
的长.
(1)一组:
![](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/41863a9a0dbc0c334677389f5b8743f0.png)
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
二组:如图3,
![](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/b6834a0601cbb9cb4b6065d25c370216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ec85281c4d38b0a888b892f1e72f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b76e5f4d9fe0cbb38ba5605071ba4d.png)
请你模仿一组同学的思路,证明二组同学猜想的结论;
【类比分析】
(2)三组:如图4,在
![](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/8386cbc70b56c686f443284b724d9b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/d694f5c9-3980-4b07-94bc-797de8483c45.png?resizew=541)
【变式拓展】
(3)四组:只需用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(4)四组:如图5,
![](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/3039c774e00f6520449aa9d4b3c45464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebf9209843e874a2b9ea5b6f33f9186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40718dbfaa4297b6fd7c9223afd7dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/ef5ca620-989a-4724-ba6c-5f5b37462b66.png?resizew=155)
您最近一年使用:0次
7 . (1)问题发现:如图1,在
和
中,
,
,连接
,填空:
;
;
(2)类比探究:如图2,在
和
中,
,连接
交
的延长线于点M,请判断
,并说明理由;
(3)拓展延伸:如图3,在(2)的条件下,将
绕点O旋转至点C与点M重合,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd4ae5d33fdc0a501b876dcfc6b5b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
,填空:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2255c5ec3e056f67109c29e56cf8aa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1397f20656d3a4117f3145102105244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b521c99e1f87bfb16c2060393482d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0594893c40c5578051097ccad61e0.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a20118349af7f5d14f8ef63e3a695dd.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/11c0fed1bec279a67db01c918711d4f5.png)
(3)拓展延伸:如图3,在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd4ae5d33fdc0a501b876dcfc6b5b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c154be32bfa30e4c463c6085b0c8912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/f1810f13-84c8-4b42-b007-e3f1c457d825.png?resizew=550)
您最近一年使用:0次
8 . 综合与实践
问题情境:
数学活动课上,王老师展示了一个问题:
如图1,
是等边三角形,点D是
边上一动点(点D不与点B重合),连接
,将线段
绕点D按逆时针方向旋转
得到线段
,连接
,并提出了如下问题:
特例探究:
(1)当点D与点A重合时,请在图2中利用尺规作图 按上述要求补全图形,连接
,请你判断此时四边形
的形状并证明;
类比拓展:
(2)当点D与点A不重合时,如图(1),试猜想
与
之间的数量关系并加以证明;
问题解决:
(3)当
,
时,直接写出
的长.
问题情境:
数学活动课上,王老师展示了一个问题:
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
特例探究:
(1)当点D与点A重合时,请在图2中利用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
类比拓展:
(2)当点D与点A不重合时,如图(1),试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
问题解决:
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c30cd7b77f8f6f0b9286ba4a6103f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/39a78e40-8492-4b85-9ebe-0a5f1e2fb009.png?resizew=452)
您最近一年使用:0次
9 . (1)发现问题:
中,若点
,
分别是边
,
边上的动点(均不与端点重合),且
,试判断
,
,
之间的数量关系.小明把
绕点
顺时针旋转
得到
,发现
,请你给出证明过程;
(2)类比探究:
如图(2),在正方形
中,若点
,
分别是边
,
延长线上的动点,且
,则(1)中的结论还成立吗?请写出证明过程.
(3)拓展应用:
在(1)中,若正方形
的边长为6,
,求
的长.
![](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/a0ed1ec316bc54c37c4286c208f55667.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/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
(2)类比探究:
如图(2),在正方形
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
(3)拓展应用:
在(1)中,若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06aed4375003b36ec24b691d03c85442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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10 . 阅读理解:
(1)如图1,在正方形
中,
、
分别是
、
上的点,且
,探究图中线段
、
、
之间的数量关系,并说明理由;
拓展延伸:
(2)如图2,任等腰直角三角形
中,
,
,点
、
在边
上,且
,写出图中线段
、
、
之间的数量关系并证明.
(1)如图1,在正方形
![](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/a0ed1ec316bc54c37c4286c208f55667.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/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/611cd1f5-e31a-4870-9511-c0e0ccff9917.png?resizew=138)
拓展延伸:
(2)如图2,任等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4978985f24d9a98892cb291b30c841c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bbec76fd-7702-4d55-9e4e-610eb4d0fe4c.png?resizew=152)
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