(2)【类比探究】如图2,△ABC和△ADE都是等腰直角三角形,∠ABC=∠ADE=90°.连接BD,CE.请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
(3)【拓展提升】如图3,△ABC和△ADE都是直角三角形,∠ABC=∠ADE=90°,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bb3810b6b55b567725a965de868e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
②延长CE交BD于点F,交AB于点G.求sin∠BFC的值.
2022·山东烟台·中考真题 查看更多[32]
2022年山东省烟台市中考数学真题(已下线)专题13 相似三角形-2022年中考数学真题分项汇编(全国通用)(第2期)山东省潍坊市青州市2022-2023学年九年级上学期期中数学试题四川省达州市通川区2022-2023学年九年级上学期期末数学试题(已下线)第五节 相似三角形03综合测云南省昆明市五华区云南大学附属中学呈贡校区2022-2023学年九年级上学期期末数学试题湖北省武汉市蔡甸区求新联盟2022-2023学年九年级3月月考数学试卷2023年湖南省岳阳市中考三模数学试题(已下线)专题12 三角形综合问题-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)山东省东营市东营区育才学校2022-2023学年九年级上学期期中数学试题(已下线)专题18图形的相似(精选33道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【山东专用】(已下线)专题32图形的相似(优选真题60道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【全国通用】湖北省襄阳市谷城县谷伯中学2022-2023学年九年级下学期期中数学试题江西省抚州市实验中学2022-2023学年九年级上学期期中数学试题陕西省西安市西光中学2023-2024学年九年级上学期期中数学试题(已下线)湖北省襄阳华侨城实验学校2023-2024学年九年级8班上学期数学周练15(已下线)清单18 相似三角形的10大经典模型-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)湖南省新市教育集团2023-2024学年九年级上学期月考数学试题陕西省西安市西咸新区沣东新城第一初级中学2023-2024学年九年级上学期月考数学试题河南省周口市第十九初级中学2023-2024学年九年级上学期期末数学试题(已下线)专题6 类比思想辽宁省盘锦市双台子区实验中学2023-2024学年九年级上学期第三次月考数学试题2023年山东省潍坊市初中学业水平考试数学一模预测题二2023年山东省济宁市兖州区中考二模数学模拟试题安徽淮南市西部地区2023-2024学年九年级下学期第一次月考数学试题江苏省连云港市新海实验中学2023-2024学年九年级下学期数学第一次月考题2023年江苏省苏州中考数学考前模拟预测题(一)山东省泰安市2024年初中学业水平数学模拟试题2024学年内蒙古乌兰察布市集宁区亿利东方学校九年级下学期第一次综合评价数学模拟试题(已下线)专题13几何类比探究题型(4大模型+解题技巧)-2024年中考数学答题技巧与模板构建(全国通用)2024年江苏省连云港市灌云县中考数学二模试题 2024 年内蒙古巴彦淖尔市临河区九年级数学中考模拟试题
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名校
【推荐1】把
的
边绕点
逆时针旋转
得到线段
,连接
,过点
作
垂足为
,连接
.
,
,
.求
的长;
(2)如图2,求证:
;
(3)如图3,已知
,将
沿着直线
折叠,得到
、连接
是直线
上的一个动点,当
最小时值为
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a5cb1247f7309d42aa2224e84eee0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bdfc4d1ceb64839a9b445d3b5cb2a6.png)
(3)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72e52864a618e0f78c7949c6fe5c743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df8c4a43cacfa481ad9eae5de0333bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6441983bc10f51c5ce7c44caef99707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452bc45740040c02eb18cf872bf807ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bee180aecbd9e8f22162d5757dfeea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847d9157e1152249b7ab9b847cc014ee.png)
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【推荐2】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.
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解题方法
【推荐1】(1)问题发现
如图1,△ABC与△ADE都是等腰直角三角形,且∠BAC=∠DAE=90°,直线BD,CE交于点F,直线BD,AC交于点G.则线段BD和CE的数量关系是 ,位置关系是 ;
![](https://img.xkw.com/dksih/QBM/2021/4/2/2691110492790784/2695510996590592/STEM/c92cd00f-a00e-4159-aa2e-92ee94853cf8.png?resizew=543)
(2)类比探究
如图2,在△ABC和△ADE中,∠ABC=∠ADE=α,∠ACB=∠AED=β,直线BD,CE交于点F,AC与BD相交于点G.若AB=kAC,试判断线段BD和CE的数量关系以及直线BD和CE相交所成的较小角的度数,并说明理由;
(3)拓展延伸
如图3,在平面直角坐标系中,点M的坐标为(3.0),点N为y轴上一动点,连接MN.将线段MN绕点M逆时针旋转90得到线段MP,连接NP,OP.请直接写出线段OP长度的最小值及此时点N的坐标.
如图1,△ABC与△ADE都是等腰直角三角形,且∠BAC=∠DAE=90°,直线BD,CE交于点F,直线BD,AC交于点G.则线段BD和CE的数量关系是 ,位置关系是 ;
![](https://img.xkw.com/dksih/QBM/2021/4/2/2691110492790784/2695510996590592/STEM/c92cd00f-a00e-4159-aa2e-92ee94853cf8.png?resizew=543)
(2)类比探究
如图2,在△ABC和△ADE中,∠ABC=∠ADE=α,∠ACB=∠AED=β,直线BD,CE交于点F,AC与BD相交于点G.若AB=kAC,试判断线段BD和CE的数量关系以及直线BD和CE相交所成的较小角的度数,并说明理由;
(3)拓展延伸
如图3,在平面直角坐标系中,点M的坐标为(3.0),点N为y轴上一动点,连接MN.将线段MN绕点M逆时针旋转90得到线段MP,连接NP,OP.请直接写出线段OP长度的最小值及此时点N的坐标.
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【推荐2】(1)如图1,已知
和
为等腰直角三角形,
,
,
,则线段
的数量关系为 ,线段
的位置关系为______.
(2)如图2,已知
和
中满足
,
,
,
,试说明
与
具有怎样的数量关系.
(3)迁移运用:如图3,已知矩形
中有一点P,连接
,
,
,
,
,求
的长.
![](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/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347c8f892b0544ce1a5a0c7a8ab4bd64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99131a028f253cbef1e4b3ca09c6a6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99131a028f253cbef1e4b3ca09c6a6b1.png)
(2)如图2,已知
![](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/d971efc64c3bbb6d038000538ca618c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b506c24f554901249694f21d9621b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3976d08e5f9e24e76ce9579c06a8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
(3)迁移运用:如图3,已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6969742348df3b4982206c8112f2202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98823cbc09ca52df1fbcc446eba3e44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c8b54beba73d15e31fb66c2e3b1128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b3bfde4b7cbca10de7d63bb7b2cfd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/6ca320bc-c077-4b87-b6b6-dd6dff7b01db.png?resizew=501)
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【推荐1】如图,AB是⊙O的直径,弦CD⊥AB于点E,G是
上一点,AG,CD的延长线交于点F,连接CG,DG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/c151d14a-b775-47df-8c32-fe3e6ada3821.png?resizew=192)
(1)求证:∠DGF=∠AGC.
(2)当ED=DF,GF=6,tanF=
时,求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/c151d14a-b775-47df-8c32-fe3e6ada3821.png?resizew=192)
(1)求证:∠DGF=∠AGC.
(2)当ED=DF,GF=6,tanF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
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【推荐2】已知在平面直角坐标系中,抛物线
交
轴于点A和点
(点A在点
的左侧),交
轴于点
.
(1)如图1,求抛物线的解析式;
(2)如图2,点
在第四象限的抛物线上,点
的横坐标为2,连接
并延长,交抛物线于点
,连接
和
,求
的值;
(3)如图3,在(2)的条件下,连接
,在
上有一点
的延长线上有一点
,连接
,过点
作
轴的平行线交
的延长线于点
,把
沿
翻折,和过点A垂直于
轴的直线交于点
,连接
和
,若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b46e03e74c3adcff205deb9ea15c126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8007bf701d1b80fbd65da026ea86e7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/3e276327-55a4-452f-b4cd-93389f4b760f.png?resizew=895)
(1)如图1,求抛物线的解析式;
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/95498325478a75149e80091dfb5607d1.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a653e9ddb3812797cfe2d0f5005350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec85ddeb8966070952660b1db18b65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fff936187b9f5c0981fbddf656f738d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941e5c2b787a25b9e65eb05e6e47e1be.png)
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【推荐3】阅读材料,某个学习小组成员发现:在等腰
中,AD平分
,∵
,
,∴
,他们猜想:在任意
中,一个内角角平分线分对边所成的两条线段与这个内角的两边对应成比例.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898787672309760/2901129019219968/STEM/d1c6351f-8871-49d1-b951-4eb084b5d9f7.png?resizew=492)
【证明猜想】如图1所示,在
中,AD平分
,求证:
.
丹丹认为,可以通过构造相似三角形的方法来证明;
思思认为,可以通过比较
和
面积的角度来证明.
(1)请你从上面的方法中选择一种进行证明.
(2)【尝试应用】如图2,
是
的外接圆,点E是
上一点(与B不重合,且
,连结
,并延长AE,BC交于点D,H为AE的中点,连结BH交AC于点G,求
的值.
(3)【拓展提高】如图3,在(2)的条件下,延长
交
于点F,若
,
,求
的直径(用x的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898787672309760/2901129019219968/STEM/d1c6351f-8871-49d1-b951-4eb084b5d9f7.png?resizew=492)
【证明猜想】如图1所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
丹丹认为,可以通过构造相似三角形的方法来证明;
思思认为,可以通过比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(1)请你从上面的方法中选择一种进行证明.
(2)【尝试应用】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86592e2a3d656179afa81c2f9713b2eb.png)
(3)【拓展提高】如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26b238eef75892ffff13b13d794f813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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