名校
1 . 已知
,
是一条角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3a7da3d2-a9aa-422d-9af6-ee68b2cb0145.png?resizew=428)
(1)【探究发现】如图1所示,若
是
的角平分线,可得到结论:
.
小红的解法如下:
过点
作
于点
,
于点
,过点
作
于点
,
是
的角平分线,且
,
,
_________________,(_________________________________________)
______________,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5196375423d865da0ca20df130da63bc.png)
(2)【类比探究】如图2所示,若
是
的外角平分线,
与
的延长线交于点
.
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
(3)【拓展应用】如图3所示,在
中,
,
、
分别是
、
的角平分线且相交于点
,若
,直接写出
的值是__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3a7da3d2-a9aa-422d-9af6-ee68b2cb0145.png?resizew=428)
(1)【探究发现】如图1所示,若
![](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/ea5ca418ff0d36929cd06551f74d58c2.png)
小红的解法如下:
过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.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/3f8eb5de7ac3b81d4bb5d79708f65034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c574f339991ec2ff4e6697ed0012f851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1d377951d7025edbd14a6be7695d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5722f22696750f74d14dc648df91846f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5196375423d865da0ca20df130da63bc.png)
(2)【类比探究】如图2所示,若
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
(3)【拓展应用】如图3所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3af091ec379c8fe8edd510b1a3fbee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e096e5531420db170acbec684aafb7.png)
您最近一年使用:0次
2022-12-12更新
|
329次组卷
|
2卷引用:上海市立达中学2022—2023学年八年级上学期12月月考数学试题
名校
2 . 如图,将一三角板放在边长为1的正方形
上,并使它的直角顶点P在对角线
上滑动,直角的一边始终经过点B,另一边与射线
相交于Q,探究;设A、P两点间的距离为
.
(1)当点Q在边
上时,线段
与
之间有怎样的数量关系?试证明你的猜想;
(2)当点Q在边
上时,设四边形
的面积为
,求
与
之间的函数关系,并写出函数自变量
的取值范围;
(3)当点P在线段
上滑动时,
是否可能成为等腰三角形?如果可能,指出所有能使
成为等腰三角形的点Q的位置,并求出相应的
值,如果不可能.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/e3f1b630-5d67-4698-96f5-f3dd54721fec.png?resizew=107)
(1)当点Q在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)当点Q在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d96e428931b19cf639d3e0f26ebe23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
名校
3 . 已知:等边△ABC边长为3,点D、点E分别在射线AB、射线BC上,且BD=CE=a(0<a<3),将直线DE绕点E顺时针旋转60°,得到直线EF交直线AC于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987882344595456/2989209304621056/STEM/3ac9e1fa-5a19-46c5-9700-9bbadb4183d1.png?resizew=441)
(1)如图1,当点D在线段AB上,点E在线段BC上时,说明BD+CF=3的理由.
(2)如图2,当点D在线段AB上,点E在线段BC的延长线上时,请判断线段BD,CF之间的数量关系并说明理由.
(3)当点D在线段AB延长线上时,线段BD,CF之间的数量关系又如何?请在备用图中画图探究,并直接写出线段BD,CF之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987882344595456/2989209304621056/STEM/3ac9e1fa-5a19-46c5-9700-9bbadb4183d1.png?resizew=441)
(1)如图1,当点D在线段AB上,点E在线段BC上时,说明BD+CF=3的理由.
(2)如图2,当点D在线段AB上,点E在线段BC的延长线上时,请判断线段BD,CF之间的数量关系并说明理由.
(3)当点D在线段AB延长线上时,线段BD,CF之间的数量关系又如何?请在备用图中画图探究,并直接写出线段BD,CF之间的数量关系.
您最近一年使用:0次
2022-05-28更新
|
381次组卷
|
11卷引用:七年级数学下学期期末全真模拟卷(1)-2021-2022学年七年级数学下学期考试满分全攻略(沪教版)
(已下线)七年级数学下学期期末全真模拟卷(1)-2021-2022学年七年级数学下学期考试满分全攻略(沪教版)上海市静安区风华初级中学2020-2021学年七年级下学期期末数学试题(已下线)第14章三角形(基础、典型、易错、压轴)分类专项训练-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(沪教版)(已下线)核心考点04 全等三角形-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(沪教版)(已下线)专题12.7 全等三角形章末八大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(人教版)福建省泉州市永春三中片区2023-2024学年八年级上学期期中数学试题(已下线)专题13.13 全等三角形章末十五大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(华东师大版)(已下线)专题14.7 全等三角形章末八大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(沪科版)(已下线)专题1.7 全等三角形章末八大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(苏科版)(已下线)专题1.13 三角形的初步知识章末十六大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(浙教版)福建省泉州市永春县2023-2024学年八年级上学期期中数学试题