1 . 问题发现:(1)如图1,
与
同为等边三角形,连接
则
与
的数量关系为________;直线
与
所夹的锐角为_________;
类比探究:(2)
与
同为等腰直角三角形,其他条件同(1),请问(1)中的结论还成立吗?请说明理由;
拓展延伸:(3)
中
,
为
的中位线,将
绕点
逆时针自由旋转,已知
,在自由旋转过程中,当
在一条直线上时,请直接写出
的值.
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257837568/STEM/5c10ba7a34bd4970942debed8b625184.png?resizew=216)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257837568/STEM/6fb7ab3f37dc403fb87994036fb7c218.png?resizew=216)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e8d80f6159c7b21b9238a0696a0da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
类比探究:(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890306fa0f59d7192c341794d1342293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
拓展延伸:(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387649e90d977c66595c127436f10134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d38160532e95012fdfbc2a1be264b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257837568/STEM/5c10ba7a34bd4970942debed8b625184.png?resizew=216)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257837568/STEM/6fb7ab3f37dc403fb87994036fb7c218.png?resizew=216)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497043290292224/2497327257837568/STEM/38ea4bc750474a0a8c55d19f6a044c56.png?resizew=273)
您最近一年使用:0次
2 . (1)问题发现
如图1,
ABC是等边三角形,点D,E分别在边BC,AC上,若∠ADE=60°,则AB,CE,BD,DC之间的数量关系是 .
(2)拓展探究
如图2,
ABC是等腰三角形,AB=AC,∠B=α,点D,E分别在边BC,AC上.若∠ADE=α,则(1)中的结论是否仍然成立?请说明理由.
(3)解决问题
如图3,在
ABC中,∠B=30°,AB=AC=4cm,点P从点A出发,以1cm/s的速度沿A→B方向勾速运动,同时点M从点B出发,以
cm/s的速度沿B→C方向匀速运动,当其中一个点运动至终点时,另一个点随之停止运动,连接PM,在PM右侧作∠PMG=30°,该角的另一边交射线CA于点G,连接PC.设运动时间为t(s),当△APG为等腰三角形时,直接写出t的值.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)拓展探究
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)解决问题
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/7/10/2502970923982848/2503804717539328/STEM/8c1226364f8c43c0ac1126ab864bff1e.png?resizew=399)
您最近一年使用:0次
2020-07-11更新
|
492次组卷
|
5卷引用:2020年河南省禹州市九年级下学期二模数学试题
3 . (1)如图①,在四边形
中,
,点
在
边上,
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec2ec6cf30c455d67c34e27fe4957c.png)
(2)探究:如图②,在四边形
中,点
在
边上,当
时,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec2ec6cf30c455d67c34e27fe4957c.png)
(3)拓展:如图③,在
中,点
是边
的中点,点
分别在边
上,若
,求
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71069b7ae2205c2f51022bd67e371772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec2ec6cf30c455d67c34e27fe4957c.png)
(2)探究:如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516bcdc180f55d0c66fe19c0712dcaef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ec2ec6cf30c455d67c34e27fe4957c.png)
(3)拓展:如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ff9d4fdd0d176042505b7aac016852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24f91e93b8b15e9c0ff4923e5015313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/b2917860-4786-4ff2-bb10-11dd13a843e6.png?resizew=500)
您最近一年使用:0次
2020-11-23更新
|
164次组卷
|
2卷引用:四川博瑞特外国语学校2020-2021学年九年级上学期期中数学试题
4 . 某数学活动小组在研究三角形的拓展图形及其性质时,经历了如下过程.
操作发现:
(1)①如图1,B为线段
上一点,分别以
,
为边作正方形
,正方形
,点P为
上一点,且
,连接
,
,那么
与
有什么关系?直接写出答案.
②如图2,B为线段
上一点,分别以
,
为斜边作等腰直角三角形
与等腰直角三角形
,点P为
的中点,连接
,
,那么
与
有什么数量关系?请给予证明.
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542406321905664/2542710919946240/STEM/144f26aa-9e10-454a-a37f-d2f9fc1fb25c.png)
数学思考:
(2)如图3,B为线段
上一点,分别以
,
为斜边作直角三角形
,直角三角形
,且
,点P为
的中点,连接
,
,那么
与
有什么数量关系?
请给予证明
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542406321905664/2542710919946240/STEM/a2110ab1-e55f-44ef-9dcb-04d57cc0332d.png)
拓展探究:
(3)如图4,B为线段
外一点,连接
,
分别
,
为斜边作直角三角形
,直角三角形
,且
,点P为
的中点,连接
,
,那么(2)中的结论还成立吗?若成立,请给予证明;若不成立,请说明理由.
操作发现:
(1)①如图1,B为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b539ad330f39b9ea2e9ebb3c99a2489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
②如图2,B为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152cfd5011c94e02c1a9cbbd4d8f58bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542406321905664/2542710919946240/STEM/144f26aa-9e10-454a-a37f-d2f9fc1fb25c.png)
数学思考:
(2)如图3,B为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152cfd5011c94e02c1a9cbbd4d8f58bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50524f9df8353f6a81de4f76bb3c4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
请给予证明
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542406321905664/2542710919946240/STEM/a2110ab1-e55f-44ef-9dcb-04d57cc0332d.png)
拓展探究:
(3)如图4,B为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152cfd5011c94e02c1a9cbbd4d8f58bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50524f9df8353f6a81de4f76bb3c4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
您最近一年使用:0次
名校
解题方法
5 . 问题提出
(1)如图(1),在等边三角形ABC中,点M是BC上的任意一点(不含端点B、C),连接AM,以AM为边作等边三角形AMN,连接CN,则∠ACN= °.
类比探究
(2)如图(2),在等边三角形ABC中,点M是BC延长线上的任意一点(不含端点C),其他条件不变,(1)中的结论还成立吗?请说明理由.
拓展延伸
(3)如图(3),在等腰三角形ABC中,BA=BC,点M是BC上的任意一点(不含端点B、C),连接AM,以AM为边作等腰三角形AMN,使AM=MN,连接CN.添加一个条件,使得∠ABC=∠ACN仍成立,写出你所添加的条件,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495819833581568/2496575626174464/STEM/725a3fa769764818b4a12d2428f0533b.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495819833581568/2496575626174464/STEM/0f094e3c8c724e6f90b47e2cb8846674.png?resizew=171)
(1)如图(1),在等边三角形ABC中,点M是BC上的任意一点(不含端点B、C),连接AM,以AM为边作等边三角形AMN,连接CN,则∠ACN= °.
类比探究
(2)如图(2),在等边三角形ABC中,点M是BC延长线上的任意一点(不含端点C),其他条件不变,(1)中的结论还成立吗?请说明理由.
拓展延伸
(3)如图(3),在等腰三角形ABC中,BA=BC,点M是BC上的任意一点(不含端点B、C),连接AM,以AM为边作等腰三角形AMN,使AM=MN,连接CN.添加一个条件,使得∠ABC=∠ACN仍成立,写出你所添加的条件,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495819833581568/2496575626174464/STEM/725a3fa769764818b4a12d2428f0533b.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495819833581568/2496575626174464/STEM/0f094e3c8c724e6f90b47e2cb8846674.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/2020/6/30/2495819833581568/2496575626174464/STEM/2413587ea8dd44bca6612c54999ee365.png?resizew=190)
您最近一年使用:0次
2020-07-01更新
|
276次组卷
|
2卷引用:2020年河南省南召县九年级中考二模数学试题
解题方法
6 . 定义:有一组邻边相等且对角互补的四边形叫做等补四边形.
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482976958144512/2485081882992640/STEM/69725a9240954524ba5f8e33279ba1a4.png?resizew=559)
【问题理解】
(1)如图1,点A、B、C在⊙O上,∠ABC的平分线交⊙O于点D,连接AD、CD.
求证:四边形ABCD是等补四边形;
【拓展探究】
(2)如图2,在等补四边形ABCD中,AB=AD,连接AC,AC是否平分∠BCD?请说明理由;
【升华运用】
(3)如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F.若CD=6,DF=2,求AF的长.
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482976958144512/2485081882992640/STEM/69725a9240954524ba5f8e33279ba1a4.png?resizew=559)
【问题理解】
(1)如图1,点A、B、C在⊙O上,∠ABC的平分线交⊙O于点D,连接AD、CD.
求证:四边形ABCD是等补四边形;
【拓展探究】
(2)如图2,在等补四边形ABCD中,AB=AD,连接AC,AC是否平分∠BCD?请说明理由;
【升华运用】
(3)如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F.若CD=6,DF=2,求AF的长.
您最近一年使用:0次
2020-06-15更新
|
290次组卷
|
2卷引用:2020年湖北省襄阳市襄城区中考适应性考试数学试题
7 . “如图1,在Rt△ABC中,∠ACB=90°,CD⊥AB于点D.”这里,根据已学的相似三角形的知识,易证:
=
.在图1这个基本图形的基础上,继续添加条件“如图2,点E是直线AC上一动点,连接DE,过点D作FD⊥ED,交直线BC于点F,设
=
.”
![](https://img.xkw.com/dksih/QBM/2019/12/28/2364731110563840/2368277763604480/STEM/5af1ea1ea95a429c95abc3c461630f8f.png?resizew=489)
(1)探究发现:如图②,若m=n,点E在线段AC上,则
= ;
(2)数学思考:
①如图3,若点E在线段AC上,则
= (用含m,n的代数式表示);
②当点E在直线AC上运动时,①中的结论是否仍然成立?请仅就图4的情形给出证明;
(3)拓展应用:若AC=
,BC=2
,DF=4
,请直接写出CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8e27dbc73e7270cd5c436e1ec346d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b648defab69faeb6479e952ecc1bfee3.png)
![](https://img.xkw.com/dksih/QBM/2019/12/28/2364731110563840/2368277763604480/STEM/5af1ea1ea95a429c95abc3c461630f8f.png?resizew=489)
(1)探究发现:如图②,若m=n,点E在线段AC上,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59691203308c8d4d0e4657639fabc43c.png)
(2)数学思考:
①如图3,若点E在线段AC上,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59691203308c8d4d0e4657639fabc43c.png)
②当点E在直线AC上运动时,①中的结论是否仍然成立?请仅就图4的情形给出证明;
(3)拓展应用:若AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
您最近一年使用:0次
2020-01-02更新
|
272次组卷
|
4卷引用:河南省南阳市方城县2019-2020学年九年级上学期期中数学试题
8 . (1)证明推断:如图①,在△ABC中,D,E分别是边BC,AB的中点,AD,CE相交于点G,求证:
.
(2)类比探究:如图②,在正方形ABCD中,对角线AC、BD交于点O,E为边BC的中点,AE、BD交于点F,若AB=6,求OF的长;
(3)拓展运用:若正方形ABCD变为□ABCD,如图③,连结DE交AC于点G,若四边形OFEG的面积为
,求□ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746418f9ba2c37d5de8c398c640d3015.png)
(2)类比探究:如图②,在正方形ABCD中,对角线AC、BD交于点O,E为边BC的中点,AE、BD交于点F,若AB=6,求OF的长;
(3)拓展运用:若正方形ABCD变为□ABCD,如图③,连结DE交AC于点G,若四边形OFEG的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/6/9/2481089359118336/2481890058305536/STEM/648d3ce012df4535bda7533c361f321d.png?resizew=413)
您最近一年使用:0次
真题
解题方法
9 . 【感知】(1)如图①,在四边形ABCD中,∠C=∠D=90°,点E在边CD上,∠AEB=90°,求证:
=
.
【探究】(2)如图②,在四边形ABCD中,∠C=∠ADC=90°,点E在边CD上,点F在边AD的延长线上,∠FEG=∠AEB=90°,且
=
,连接BG交CD于点H.求证:BH=GH.
【拓展】(3)如图③,点E在四边形ABCD内,∠AEB+∠DEC=180°,且
=
,过E作EF交AD于点F,若∠EFA=∠AEB,延长FE交BC于点G.求证:BG=CG.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd4af2c49cfde809f4bdae31f946a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d404987966bfe1b32ebcaaf91c2d78d0.png)
【探究】(2)如图②,在四边形ABCD中,∠C=∠ADC=90°,点E在边CD上,点F在边AD的延长线上,∠FEG=∠AEB=90°,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232e6f5e7b978ee341cb75283fbd328e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd4af2c49cfde809f4bdae31f946a4a.png)
【拓展】(3)如图③,点E在四边形ABCD内,∠AEB+∠DEC=180°,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd4af2c49cfde809f4bdae31f946a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5731d679887ca3bbf45d476c5d16b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/72a019c8-b280-470f-bc86-2384c020f23d.png?resizew=364)
您最近一年使用:0次
2020-08-07更新
|
3960次组卷
|
16卷引用:江苏省宿迁市2020年中考数学试题
江苏省宿迁市2020年中考数学试题安徽省安庆市太湖县2020-2021学年九年级上学期期末数学试题(已下线)考点20 图形的相似-备战2021年中考数学核心考点清单(已下线)热点05 三角形的全等与相似-2021年中考数学【热点·重点·难点】专练2021年山东省临沂市中考数学二模试题(已下线)重难点06 几何类综合问题-2021年中考数学【热点·重点·难点】专练(已下线)专题27.36 相似三角形几何模型-一线三等角(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)(已下线)卷2-备战2022年中考数学【名校地市好题必刷】全真模拟卷(江苏无锡专用)·第一辑(已下线)专题13 平行线、展开图、对称性-三年(2020-2022)中考数学真题分项汇编(江苏专用)(已下线)专题15 三角形解答题-三年(2020-2022)中考数学真题分项汇编(江苏专用)(已下线)专题21 图形的相似-三年(2020-2022)中考数学真题分项汇编(江苏专用)(已下线)第12讲 相似三角形中的“手拉手”旋转型-【多题一解&一题多解】冲刺2023年中考数学满分应对方法与策略(全国通用)(已下线)数学(陕西卷)-学易金卷:2023年中考考前押题密卷(含考试版、全解全析、参考答案、答题卡)四川省乐山市马边彝族自治县2022-2023学年九年级下学期期中数学试题湖南省岳阳市汨罗市任弼时红军中学2023-2024学年九年级下学期开学考试数学试题(已下线)数学(陕西卷)-学易金卷:2024年中考第一次模拟考试
解题方法
10 . 如图,在
中,
,
,正方形
的边长为2,将正方形
绕点
旋转一周,连接
、
、
.
(1)猜想:
的值是__________,直线
与直线
相交所成的锐角度数是__________;
(2)探究:直线
与
垂直时,求线段
的长;
(3)拓展:取
的中点
,连接
,直接写出线段
长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/84d66eee-6f52-4527-84de-987307e04917.png?resizew=545)
(1)猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1682a8242948cc1d76eddef3e50836f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)探究:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)拓展:取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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