已知:AD为△ABC的中线,分别以AB和AC为一边在△ABC的外部作等腰三角形ABE和等腰三角形ACF,且AE=AB,AF=AC,连接EF,∠EAF+∠BAC=180°.
(2)如图1,求证:EF=2AD.
(3)如图2,设EF交AB于点G,交AC于点R,FC与EB交于点M,若点G为EF中点,且∠BAE=60°,请探究∠GAF和∠CAF的数量关系,并证明你的结论.
(2)如图1,求证:EF=2AD.
(3)如图2,设EF交AB于点G,交AC于点R,FC与EB交于点M,若点G为EF中点,且∠BAE=60°,请探究∠GAF和∠CAF的数量关系,并证明你的结论.
21-22八年级上·湖南湘潭·期末 查看更多[6]
湖南省湘潭市2021-2022学年八年级上学期期末数学试题湖南省湘潭市湘潭县2021-2022学年八年级上学期期末数学试题(已下线)第一次月考难点特训(一)与三角形的内外角有关的压轴题-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(浙教版)(已下线)专题06 全等三角形中的常考模型-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(湖南专用)吉林省吉林市舒兰市2023-2024学年八年级上学期期末数学试题四川省四川大学附属中学西区学校2023-2024学年八年级下学期3月月考数学试题
更新时间:2022-07-18 15:22:46
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【推荐1】如图1,直线AB∥CD,直线l与直线AB,CD相交于点E,F,点P是射线EA上的一个动点(不包括端点)
(1)若∠CFE=119°,PG交∠FEB的平分线EG于点G,∠APG=150°,则∠G的大小为 .
(2)如图2,连接PF.将△EPF折叠,顶点E落在点Q处.
①若∠PEF=48°,点Q刚好落在其中的一条平行线上,请直接写出∠EFP的大小为 .
②若∠PEF=75°,∠CFQ=
∠PFC,求∠EFP的度数.
(1)若∠CFE=119°,PG交∠FEB的平分线EG于点G,∠APG=150°,则∠G的大小为 .
(2)如图2,连接PF.将△EPF折叠,顶点E落在点Q处.
①若∠PEF=48°,点Q刚好落在其中的一条平行线上,请直接写出∠EFP的大小为 .
②若∠PEF=75°,∠CFQ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/3/6/2413494817300480/2413755961032704/STEM/fc64c0bd74ef48b7b6d4726dcc330064.png?resizew=449)
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【推荐2】如图,
为等腰直角三角形,
,
,
为
的中线
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/cc6c6316-56a3-4969-94dc-a340499ce494.png?resizew=504)
(1)如图1,求证:
为等腰直角三角形;
(2)如图2,若
为线段
上一动点(不与点
,
重合),以
为直角边作等腰直角
,其中
,点A,
在直线
同侧,连接
,求证:
;
(3)若
为线段
延长线上一动点,以
为直角边作等腰直角
,其中
,点A,
在直线
同侧,且点A关于直线
对称点记为
,请在图3上补全图形,求证:
,
,
三点在同一条直线上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/cc6c6316-56a3-4969-94dc-a340499ce494.png?resizew=504)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cedf92176253809c9d1513f96e14d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4557ee10ad429943f40252d9bb90565.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cedf92176253809c9d1513f96e14d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解题方法
【推荐1】数学课上,李老师出示了如下的题目:如图1,在等边
中,点
在
上,点
在
的延长线上,且
,试确定线段
与
的大小关系,并说明理由,
(1)小敏与同桌小聪探究解答的思路如下:
①特殊情况,探索结论,
当点
为
的中点时,如图2,确定线段
与
的大小关系,请你直接写出结论:
______
.(填>,<或=)
②特例启发,解答题目,
解:题目中,
与
的大小关系是:
______
.(填>,<或=)
理由如下:如图3,过点
作
,交
于点
,(请你补充完成解答过程)
(2)拓展结论,设计新题,
同学小敏解答后,提出了新的问题:在等边
中,点
在直线
上,点
在直线
上,且
,已知
的边长为
,求
的长?(请直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/abc1bc63-183b-47ad-81a8-5eab908c16ad.png?resizew=159)
(1)小敏与同桌小聪探究解答的思路如下:
①特殊情况,探索结论,
当点
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/feb16ee8-d051-40c5-b327-af15db72261e.png?resizew=171)
②特例启发,解答题目,
解:题目中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
理由如下:如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284efb70e6dfbab8026d58b5d68b5114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/d334f032-06ce-4fd5-8416-3a87a69d7974.png?resizew=146)
(2)拓展结论,设计新题,
同学小敏解答后,提出了新的问题:在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4554189cce9ba0a9b8ac256aabf68527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】△ABC中,射线AD平分∠BAC,AD交边BC于E点.
(1)如图1,若AB=AC,∠BAC=90°,则
( )
;
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/a2f6c453dd704f7ab32ba4785d66ad35.png)
(2)如图2,若AB≠AC,则(1)中的结论是否仍成立?若成立,请证明;若不成立,请说明理由;
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/932c43fb3f974d148f0b32118dd2c2a1.png)
(3)如图3,若AB>AC,∠BAC=∠BDC=90°,∠ABD为锐角,DH⊥AB于H,则线段AB、AC、BH之间的数量关系是( ),并证明.
(1)如图1,若AB=AC,∠BAC=90°,则
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/e6d8f957c5534868bb9f7963a4021e8c.png)
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/2c777c6362ce46b78f105ae0fb2e518f.png)
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/a2f6c453dd704f7ab32ba4785d66ad35.png)
(2)如图2,若AB≠AC,则(1)中的结论是否仍成立?若成立,请证明;若不成立,请说明理由;
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/932c43fb3f974d148f0b32118dd2c2a1.png)
(3)如图3,若AB>AC,∠BAC=∠BDC=90°,∠ABD为锐角,DH⊥AB于H,则线段AB、AC、BH之间的数量关系是( ),并证明.
![](https://img.xkw.com/dksih/QBM/2014/1/10/1573697315946496/1573697321869312/STEM/50ca1c8b0d0d4f33a1132636df699d8f.png)
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【推荐1】如图①,在
中,延长
到D,使
,E是
上方一点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1857fd0d79fb8cbb8045e949984104e3.png)
是等腰三角形;
(2)如图①,若
,将
沿直线
翻折得到
,连接
和
,
与
交于F,若
,求证:F是
的中点;
(3)在如图②,若
,
,连接
交
于F,交
于G.若
,
(
),求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4a2a127d89d50d3fde881a9b58ef0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1857fd0d79fb8cbb8045e949984104e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(2)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f222edb32c941fe3f76a803faae410c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
(3)在如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f5e84face94dbd6188b44e02739c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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解题方法
【推荐2】如图,在平面直角坐标系中,抛物线
与x轴交于
两点,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/01ce30cf-d19b-47fa-bf7f-0bdf92cc40fb.png?resizew=563)
(1)求抛物线的表达式;
(2)连接
,在x轴上求作一点D,使
有最小值,求出此时
的度数和点D的坐标;
(3)M为线段
中点,E为抛物线上一点,将点E绕者点M旋转
后得点N,当四边形
为菱形时,求N点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a3a1fae8fff0ded26ba9603ffda483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acab25020a238f64d2b363615d105b00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/01ce30cf-d19b-47fa-bf7f-0bdf92cc40fb.png?resizew=563)
(1)求抛物线的表达式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b809b8c92ba554892e76d29dcd211f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(3)M为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b34095263126074b82300c7ae799cab.png)
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