1 . 综合与实践
【问题发现】
在学习了“特殊的四边形”后,数学兴趣小组的同学发现了这样一个问题:
如图1,已知正方形
为对角线
上一动点,过点
作垂直于
的射线
,点
在射线
上,且
,连接
.
通过观察图形,数学兴趣小组的同学进行了如下猜想:
猜想①:
;
猜想②:
;
猜想③:点
在
上运动的过程中,四边形
的面积不变.
根据上述猜想,兴趣小组的同学进行了证明,过程如下:
四边形
是正方形,
,
,
,即
.
.
.
又
,
.
(依据:________).
……
(1)上述证明过程中的依据是________,上述猜想中正确的有________(填序号).
【类比探究】
(2)兴趣小组的同学在探究了正方形中的结论后,将正方形换成矩形继续探究.
如图
,已知矩形
,
,
为对角线
上一动点,过点
作垂直于
的射线
,点
在射线
上,且
,连接
.
①请判断线段
与
的数量关系,并说明理由.
②点
在
上运动时,四边形
的面积是否改变?________.(填“不变”或“改变”)
【拓展应用】
(3)在(2)的条件下,若
,点
在
上运动,当四边形
为轴对称图形时,请直接写出线段
的长.
【问题发现】
在学习了“特殊的四边形”后,数学兴趣小组的同学发现了这样一个问题:
如图1,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d11e19c84255eb0431415c2dec553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6218fe7c62cd2dd2b7c70b8f91a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
通过观察图形,数学兴趣小组的同学进行了如下猜想:
猜想①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
猜想②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
猜想③:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49404e6b19a342401a80d9feb1144605.png)
根据上述猜想,兴趣小组的同学进行了证明,过程如下:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1405bc4f389184d2c358a9a399940c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dec3857ac2b262e594e3ec33685c516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fef99a168f297bc9892e1da02ad89bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4156ccacaff769fa77244e3d614a898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b789a8e176dfc5b2dcc402b5efd9f2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3202a225bbcf6efabda3ffd6bd98e1e6.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4dc56b72f2d33c5dd350b922d27db10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb25a35a9674a5a353279f3f1db4b55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35146b5e2d8dafcb4767f389adb02973.png)
……
(1)上述证明过程中的依据是________,上述猜想中正确的有________(填序号).
【类比探究】
(2)兴趣小组的同学在探究了正方形中的结论后,将正方形换成矩形继续探究.
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6218fe7c62cd2dd2b7c70b8f91a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
①请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef48918ed426d68d64591b866998a10.png)
【拓展应用】
(3)在(2)的条件下,若
![](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/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef48918ed426d68d64591b866998a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
您最近一年使用:0次
2024-03-20更新
|
111次组卷
|
4卷引用:专题06 四边形中的证明与计算问题-2024年中考数学二轮热点题型归纳与变式演练(江苏专用)
(已下线)专题06 四边形中的证明与计算问题-2024年中考数学二轮热点题型归纳与变式演练(江苏专用)2023年河南省商丘市永城市中考二模数学模拟试题2024年河南省南阳市南召县中考一模数学试题2023年河南省中考猜押密卷三·数学模拟预测题
2 . 【探究证明】
(1)某班数学课题学习小组对矩形内两条互相垂直的线段与矩形两邻边的数量关系进行探究,提出下列问题,请你给出证明:
如图①,在矩形
中,
,
分别交
于点E、F,
分别交
于点G、H,求证:
;
【结论应用】
(2)如图②,将矩形
沿
折叠,使得点B和点D重合,若
,求折痕
的长;
【拓展运用】
(3)如图③,将矩形
沿
折叠.使得点D落在
边上的点G处,点C落在点P处,得到四边形
,若
,求
的长.
(1)某班数学课题学习小组对矩形内两条互相垂直的线段与矩形两邻边的数量关系进行探究,提出下列问题,请你给出证明:
如图①,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de64cbea23ec8a57a4705d9f16297d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f0dc39b4e4d3dcbf0baebc83221238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450d0c8cdc114d1d6ba7f69382d9df3e.png)
【结论应用】
(2)如图②,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb9ed77d586a7976de01e7551cdb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【拓展运用】
(3)如图③,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0363419eabe432409a7f04598450a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c414fba9b21b6e8a8035bd6293e7fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/d8fd358a-6156-4334-936c-1d7333e1b22d.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/2bf61200-0eef-4840-a16b-e3928558fe1d.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/c244c5c8-91d8-494e-8f34-26b238218137.png?resizew=155)
您最近一年使用:0次
2023-10-31更新
|
148次组卷
|
3卷引用:江苏省扬州市梅岭中学教育集团2023-2024学年九年级上学期10月月考数学试题
名校
3 . 综合与实践
沿过点A的直线折叠,使点B落在正方形内部的点M处,折痕为
,再将纸片沿过点A的直线折叠,使
与
重合,折痕为
,请写出图中的一个
角:______.
(2)【拓展探究】如图2,孔明小组继续将正方形纸片沿
继续折叠,点C的对应点恰好落在折痕
上的点N处,连接
交
于点P.
①
______度;
②若
,求线段
的长.
(3)【迁移应用】如图3,在矩形
,点E,F分别在边
上,将矩形
沿
,
折叠,点B落在点M处,点D落在点G处,点A,M,G恰好在同一直线上,若点F为
的三等分点,
,
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
(2)【拓展探究】如图2,孔明小组继续将正方形纸片沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e962382788c6e211bdf42a7a0fe45ef.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
(3)【迁移应用】如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2023-10-18更新
|
460次组卷
|
7卷引用:清单15 相似三角形的性质与判定(3个考点梳理+17种题型解读+提升训练)-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
(已下线)清单15 相似三角形的性质与判定(3个考点梳理+17种题型解读+提升训练)-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)2023年河南省洛阳市洛宁县二模数学试题(已下线)2023年河南省二模(几何综合2)浙江省杭州市西湖区杭州外国语学校2023-2024学年九年级上学期10月月考数学试题2024年辽宁省初中学业水平数学模拟预测题(二)(已下线)专题11 四边形压轴题综合-2024年中考数学二轮热点题型归纳与变式演练(全国通用)2023年河南省郑州市中原区名校中考数学模拟预测题(一)
4 . 【问题背景】
如图,正方形
的边长为8,E是
边的中点,点P在射线
上,过点P作
于点F,连接
.
【初步探究】
(1)求证:
;
(2)若点 P在
边上运动,且
,求
与
的相似比;
【拓展提升】
(3)当点P在射线
上运动时,设
,是否存在实数x,使得以点P、F、E为顶点的三角形与
相似?若存在,请求出x的值;若不存在,请说明理由.
如图,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/c6c66902c5f7d00de2e4ba9ccfcfd759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
【初步探究】
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60ce7c05557fcce4f4d62b823f8c295.png)
(2)若点 P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62da9c9392ebbb45080685a6863cd9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab891b5ede1b29e9e127aa3040eb08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a3a178728fad09bc17d8af4493cf9b.png)
【拓展提升】
(3)当点P在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219e10456959f991b36a075972bcdbfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a3a178728fad09bc17d8af4493cf9b.png)
您最近一年使用:0次
2024-01-22更新
|
93次组卷
|
3卷引用:江苏省南京市中考数学仿真预测卷-2024年中考数学【热点·重点·难点】专练(江苏专用)
(已下线)江苏省南京市中考数学仿真预测卷-2024年中考数学【热点·重点·难点】专练(江苏专用)陕西省咸阳市秦都区2023-2024学年九年级上学期期末数学试题2024年陕西省渭南市澄城县中考一模数学试题
5 . (1)发现:如图①所示,在正方形
中,
为
边上一点,将
沿
翻折到
处,延长
交
边于
点,求证:
;
(2)探究:如图②,在矩形
中,
为
边上一点,且
,
,将
沿
翻折到
处,延长
交
边于
点,延长
交
边于点
,且
,求
的长.
(3)拓展:如图③,在菱形
中,
,
为
边上的三等分点,
.将
沿
翻折得到
,直线
交
于点
,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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b59bbee2de231210bcbf54712ef652.png)
(2)探究:如图②,在矩形
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f46b6b3841a2e590438cdf030dd81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)拓展:如图③,在菱形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/e2dd6a80-bbdc-420b-a3c5-c3013230b27f.jpg?resizew=389)
您最近一年使用:0次
2023-09-06更新
|
285次组卷
|
3卷引用:2023年江苏省南通市崇川初级中学中考三模数学试题
2023年江苏省南通市崇川初级中学中考三模数学试题(已下线)专题16相似三角形的性质(3个知识点4种题型1个中考考点)-【帮课堂】2023-2024学年九年级数学上册同步学与练(北师大版)2023年广西玉林市容县中考数学一模模拟试题
名校
6 . 【概念呈现】
在钝角三角形中,若钝角的度数恰好是其中一个锐角的度数与
度的和,则称这个钝角三角形为和美三角形,这个锐角叫做和美角;
【性质探究】
(
)如图
,
是和美三角形,
是钝角,
是和美角,求证:
;
【拓展应用】
(
)
中,
,
是边
上一点,连接
,
是和美三角形;
如图
,若
,
,求
的长;
若
是和美角,延长
到点
,连接
,使
,当
是和美三角形时,直接写出
的度数.
在钝角三角形中,若钝角的度数恰好是其中一个锐角的度数与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
【性质探究】
(
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c16074db3384a6d106ed98ff1a5512.png)
【拓展应用】
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.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/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbb9f3b6f6c37e6a4becafd0417ade1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
您最近一年使用:0次
7 . 已知两个矩形,若其中一个矩形的四个顶点分别在另一个矩形的四条边上(顶点不重合),我们称这个矩形为另一个矩形的“衍生矩形”.
【模型探究】(1)如图1,矩形
是矩形
的“衍生矩形”,不连接其它线段,图中有哪几组全等三角形,请写出并任选一组证明;
【迁移应用】(2)如图2,在矩形
中,
,
.点M在线段
上,且
,点N是
边上的动点,连接
,以
为边作矩形
,点P在
边上,点Q落在矩形
内.连接
,
,当
面积为
时,求
的长;
【拓展延伸】(3)如图3,在矩形
中,
,
.点N是
的中点,点M是
边上的动点,连接
,以
为边作矩形
,点P在
边上,点Q始终落在矩形
内(不含边界).连接
,点O是
的中点,连接
,求
长的取值范围(用含a,b的式子表示).
【模型探究】(1)如图1,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【迁移应用】(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a973f7b8e6acbd272a931d750d48b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217d37ca5469a57cb7417a2ac0d58efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec85f29c0860b57a8f0cf8098c13a97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
【拓展延伸】(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9993bc6f3dd6a629b0c73189eebd9a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a3eb9576531c4ca1077be7cb5ef14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a3eb9576531c4ca1077be7cb5ef14b.png)
您最近一年使用:0次
2024-06-13更新
|
101次组卷
|
2卷引用:2024年江苏省镇江市市属学校九年级数学第二次中考模拟试题
名校
8 . 在平行四边形
中,
点E,F分别为线段
和
延长线上的点,连接
与
交于点G,连接
,设
.
【问题提出】(1)如图1,延长
交
于点P,求证:
=
;
【深入探究】(2)如图2,若
,求
的最小值;
【拓展提高】(3)如图3,若
,当
时,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db9bbb8b6fa72e306b4c4771d33949f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ddcc7a77ea95269a7b87543be5c9ad.png)
【问题提出】(1)如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e253f26da9c7c4b5e8fcfac3ca0f168d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f692d0437e200690eabcd84ebcfa8a9.png)
【深入探究】(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfba12f7f829e7260c2c30413944334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
【拓展提高】(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16b7cc6f6f5eb039b1f10e4880f482e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0565bafba84b317d92ac6855ab1c3468.png)
您最近一年使用:0次
9 . 如图,已知
中,
,点D在边
上,
.数学老师让同组的几位同学用一块含
的三角板
,开展如下的数学探究活动:将
绕着点D按顺时针方向旋转,旋转过程中
边
始终分别与
的边
相交于点M、N.
的旋转过程中,若
,则
(2)【一般化研究】在三角板
的旋转过程中,
的值是否为定值,若是,求出这个定值;若不是,说明理由;
(3)【拓展延伸】
①如图1,在三角板
的旋转过程中,求
的最大值;
②如图2,连接
,取
的中点P,在旋转过程中,求点N在从点C运动到点B的过程中,点P运动的路径为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b936182f90e4d0d15dfb472d06d0fc40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9448ed41959f512727b8279c2cbd60a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a907eb9b989977bd5d9b8279f3e6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535ae08686abe8e4882b6b9cdf3e5b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccd0a34420ce560ea56cceabfe12193.png)
(2)【一般化研究】在三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43d8e391559e10a45c7b53189366b68.png)
(3)【拓展延伸】
①如图1,在三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e0703f9aae322d175ee41a43f30b67.png)
②如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
10 . 问题背景:已知
的顶点
在
的边
上(不与
,
重合).
交
所在直线于点
,
交
所在直线于点
.记
的面积为
,
的面积为
.
(1)初步尝试:如图①,当
是等边三角形,
,
,且
,
时,则
;
类比探究:在(1)的条件下,先将点
沿
平移,使
,再将
绕点
旋转至如图②所示位置,求
的值;
(2)延伸拓展:当
为等腰三角形时,设
.
(Ⅰ)如图③,当点
在线段
上运动时,设
,
,则
的表达式为 (结果用
,
和
的三角函数表示).
(Ⅱ)如图④,当点
在
的延长线上运动时,设
,
,求
的表达式,写出解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbad58593bfa5ac1299de80c5a0f9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/46383b57-2d2d-4826-a5fe-4bc3536c13ce.png?resizew=522)
(1)初步尝试:如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4550af14ce0b04bf33f16dd8793ee0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
类比探究:在(1)的条件下,先将点
![](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/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40a97fd767e95f34f3b91ab8d84c.png)
(2)延伸拓展:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deeb069549dbac4b45bb545ef91ab163.png)
(Ⅰ)如图③,当点
![](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/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40a97fd767e95f34f3b91ab8d84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(Ⅱ)如图④,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40a97fd767e95f34f3b91ab8d84c.png)
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