如图,在
中,
,D,E,F分别为
的中点,连接
.
;
(2)如图2,将
绕点D顺时针旋转一定角度,得到
,当射线
交
于点G,射线
交
于点N时,连接
并延长交射线
于点M,判断
与
的数量关系,并说明理由;
(3)如图3,在(2)的条件下,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa19c51dbbe45747c16bad72ebb48416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f03275121546fa339568575c776a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1345db948eb86622239183c0e8c5ff53.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46060ff16376f584eb554e09686ab703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
(3)如图3,在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824938c27f63ba9b36eaea6cdd389e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
2022·辽宁·中考真题 查看更多[9]
2022年辽宁省朝阳市中考数学真题(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)2022年辽宁省锦州市中考数学真题广东省深圳市光明区公明中学2022-2023学年九年级上学期10月月考数学试卷(已下线)第五节 图形的旋转与位似01技法提练(已下线)黄金卷3-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广西新中考专用)(已下线)专题31图形的旋转(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】湖北省襄阳市襄阳实验中学2023-2024学年九年级下学期第一次月考数学试题2024年上海市杨浦区中考四模数学试题
更新时间:2022-07-05 13:24:35
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解答题-问答题
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解题方法
【推荐1】已知,在正方形
中,
是以点
为直角顶点的等腰直角三角形,连接
并取其中点G,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/64a553fd-8a8b-4c16-b6a8-7f682db9b5ad.jpg?resizew=459)
(1)如图1,若
的顶点E在线段
上,则
和
的关系______;
(2)如图2,若
的顶点E在线段
上时,则(1)中的结论是否还成立?请说明理由;
(3)若
的顶点E在
内,如图3位置所示,则(1)中的结论是否还成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c59076e80b15755ef630fd5f40d1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbe3d509ed0c87eee5034fd2160a88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a174360ec4bde7dc70e806a03166f080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560c48ee30dcf219ccc39c6aab0dad0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/64a553fd-8a8b-4c16-b6a8-7f682db9b5ad.jpg?resizew=459)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83511c460cbd4800bfa13a986c445fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a174360ec4bde7dc70e806a03166f080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560c48ee30dcf219ccc39c6aab0dad0a.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0764ee446a6280bad108c96c1445f6ca.png)
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【推荐2】如图,Rt△ABC中,∠ACB=90°,D为AB中点,连接CD,过C作CE垂直于CD交BA延长线于E.
(1)求证:△ECA∽△EBC;
(2)若
,求tanB;
(3)在(2)的条件下,线段BC上有一点F,若CF:FB=1:2且EF=10,求AB的长.
(1)求证:△ECA∽△EBC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fa96769a53e30aae5964588d27f1b1.png)
(3)在(2)的条件下,线段BC上有一点F,若CF:FB=1:2且EF=10,求AB的长.
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【推荐1】如图,点G是矩形
内一点,
,把
绕点C按顺时针方向旋转
,得到
(点B对应点
,点G对应点
)延长
交
于点E,连接
.
的形状,并说明理由;
(2)如图1,若
,
,
,求
;
(3)如图2,若
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dc277923dc2a5bb140939374b9a40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22161f567e6b5e9649521030875ae531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14996e24510c7cd9b4063dcd2687b5de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3cfaa86f87c412509830529c9a7a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92edf323eb2b2a7c211fd9badee179aa.png)
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238c60cff40f83f1f20e6fef1265f89f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7bc807ac8a0c0468807bc473c134e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86e2d4453ef26938345402861463937.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e875bf5e28d3c4fca84922686dd5eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75911d2cdd95996b6c411cb6bcc92234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6dca0c2fa7b62beb6b2e7d492e6e23e.png)
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【推荐2】定义:有一组邻边相等且对角互补的四边形称为“等补四边形”.
(1)下列选项中一定是“等补四边形”的是________;
A.平行四边形; B.矩形; C.正方形; D.菱形
(2)如图1,在边长为a的正方形
中,E为
边上一动点(E不与C、D重合),
交
于点F,过F作
交
于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/5371fa60-dbba-4e28-8d69-11a2383c3e18.png?resizew=362)
①试判断四边形
是否为“等补四边形”并说明理由;
②如图2,连接
,将
绕A点逆时针旋转
得到
,判断线段
与线段
的数量关系,并求
的周长;
③若四边形
是“等补四边形”,当
时,求
的长.
(1)下列选项中一定是“等补四边形”的是________;
A.平行四边形; B.矩形; C.正方形; D.菱形
(2)如图1,在边长为a的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/e1c31f727a845520711124b398da2dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/5371fa60-dbba-4e28-8d69-11a2383c3e18.png?resizew=362)
①试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613c9d8e210a1d4afb34cc1f64dcdc76.png)
②如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e08f94f97643937217ba0aea4e0c92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd8fdc8fd8b52394dce50224c9cfafc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03a4ded4139849e9dce4deae876a78c.png)
③若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f15bb171b383aa2f10459b18e636ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐1】如图,平行四边形
中,
,
,点P是边
上一动点,点Q在射线
上,满足
,直线
与直线
交于点E,射线
与直线
交于点F,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/31f9b092-80da-4003-b044-afe6f67d262b.png?resizew=321)
(1)求证:
;
(2)当点Q在线段
上时,设
,求y关于x的函数解析式,并写出定义域;
(3)若CE=5PC,求BP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b75e475ea055f41ba81aa87941d5233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905f306dc08525842a96cfcab32c1ce8.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/2c1b4de88d06ba19b08b291d1cb472cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/31f9b092-80da-4003-b044-afe6f67d262b.png?resizew=321)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929c289835a03369f962f1fecfa6b044.png)
(2)当点Q在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cfb3964370c13f0aa705da5e254e834.png)
(3)若CE=5PC,求BP的长.
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【推荐2】一块直角三角形木板,它的一条直角边
,面积
.甲、乙两人分别按图把它加工成一个正方形桌面,请说明哪个正方形面积大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a2d3b03efafac4c45d63e24897cb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601eb8ba289db872019d71f8c759df0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f618d7de-5cd4-400f-873b-d559b37b59ed.png?resizew=361)
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【推荐1】在
中,
,
,
是
上一点,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(1)如图1,若
,
是
延长线上一点,
与
垂直,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ec1827a09872159663c8d1998a0ff2.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247263743164416/2248624258138112/STEM/674bd2b0c3db429192cf30ddb0e33c27.png?resizew=140)
(2)过点
作
,
为垂足,连接
并延长交
于点
.
①如图2,若
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f899289df4a6ca77be8b09f1be0c5c22.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247263743164416/2248624258138112/STEM/365b4dbb28dc4031a2f0b9a9655c4c3c.png?resizew=113)
②如图3,若
是
的中点,直接写出
的值(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f86c920706035d943b6baa236762e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ec1827a09872159663c8d1998a0ff2.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247263743164416/2248624258138112/STEM/674bd2b0c3db429192cf30ddb0e33c27.png?resizew=140)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b495f6f1567e247e33512e65e9b750d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f899289df4a6ca77be8b09f1be0c5c22.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247263743164416/2248624258138112/STEM/365b4dbb28dc4031a2f0b9a9655c4c3c.png?resizew=113)
②如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0060b0476d15e4316a257c6b5c3444f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247263743164416/2248624258138112/STEM/bc01ad0591ce484db093a8243b73eb9c.png?resizew=94)
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较难
(0.4)
【推荐2】在平面直角坐标系中,抛物线
与
轴交于
,
两点(点
在点
的左侧),点
的坐标为
,与
轴交于点
,顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/d18e1074-75c8-4e63-a632-d6125bd7ea9d.png?resizew=181)
(1)求抛物线的解析式及顶点
的坐标;
(2)连接
,
,求
的正切值;
(3)点
是抛物线的对称轴上一点,当
与
相似时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.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/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/d18e1074-75c8-4e63-a632-d6125bd7ea9d.png?resizew=181)
(1)求抛物线的解析式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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