已知:如图,将
绕点
旋转一定角度得到
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/b4e065e1-f2a9-40d1-897c-a97a5226711f.png?resizew=191)
(1)求证:
;
(2)若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fc244cd861838fd5161d1c64b50a21.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/b4e065e1-f2a9-40d1-897c-a97a5226711f.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99c4048ee0b85ab93ab654cc12deed2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fe75f967e8915c9124a5d4ac420a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
2022·江苏常州·一模 查看更多[12]
2022年江苏省常州市武进区前黄实验学校中考模拟数学试题江苏省常州市前黄实验学校2021~2022学年九年级下学期新课结业考数学试题2022年江苏省溧阳市九年级下学期模拟测试数学试题(已下线)2022年江苏省常州市中考数学变式题24-28湖南省长郡雨花外国语学校2022-2023学年九年级上学期第一次月考数学试题山西省吕梁市柳林县2022—2023学年九年级上学期期中评估数学试题陕西省商洛市商南县富水镇初级中学2022-2023学年九年级上学期数学期中试题江西省上饶市鄱阳县2022-2023学年九年级上学期期中数学试卷山西省运城市平陆县2022-2023学年九年级上学期中考试数学试卷安徽省阜阳市太和县三堂中学2022-2023学年九年级上学期期中综合评估数学试卷(已下线)专题01 图形的旋转与中心对称【知识梳理+专项训练】-2022-2023学年八年级数学下学期期中期末考点大串讲(苏科版)(已下线)核心考点01 图形的旋转与中心对称-【满分全攻略】2022-2023学年八年级数学下学期核心考点+重难点讲练与测试(苏科版)
更新时间:2022-04-11 13:47:49
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相似题推荐
解答题-证明题
|
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【推荐1】如图,在等边△ABC中,点D是射线AC上一点,连接BD,过点A作AE⊥BD于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/8cf6300b-8546-4dc2-b152-bb9cba88ead4.png?resizew=257)
(1)如图1,当点D在边AC上时,连接CE并延长,交AB于点F,若∠CBD=15°,AB=4,求CE的长;
(2)如图2,当点D在线段AC的延长线上时,将线段AE绕点A逆时针旋转60°得到线段AF,连接EF,交BC于G,连接CF,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/8cf6300b-8546-4dc2-b152-bb9cba88ead4.png?resizew=257)
(1)如图1,当点D在边AC上时,连接CE并延长,交AB于点F,若∠CBD=15°,AB=4,求CE的长;
(2)如图2,当点D在线段AC的延长线上时,将线段AE绕点A逆时针旋转60°得到线段AF,连接EF,交BC于G,连接CF,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc08baf67044328fb366669a454826a.png)
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解答题-证明题
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【推荐1】如图,E,F分别是矩形ABCD的边AB,AD上的点,∠FEC=∠FCE=45°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/e7a1fbf4-a3e2-477e-900e-2f711504fec3.png?resizew=199)
(1)求证:AE=DF;
(2)若AD= 6,
EFC的面积为10,求线段BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/e7a1fbf4-a3e2-477e-900e-2f711504fec3.png?resizew=199)
(1)求证:AE=DF;
(2)若AD= 6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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解答题-问答题
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【推荐2】如图,已知
中,
,
,
,在
内部求做一正方形,问怎样截取可以使正方形的面积最大,并求出此时正方形的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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【推荐1】综合与实践
在矩形
中,
,
,现将纸片折叠,点D的对应点记为点P,折痕为
(点E、F是折痕与矩形的边的交点),再将纸片还原.
【初步思考】
(1)若点P落在矩形
的边
上(如图①).
①当点P与点A重合时,
;②当点E与点A重合时,
.
【深入探究】
(2)当点E在
上,点F在
上时(如图②),
①求证:四边形
为菱形;
②当
时,求
的长.
【拓展延伸】
(3)若点F与点C重合,点E在边
上,射线
与射线
交于点M(如图③).在各种不同的折叠位置中,是否存在使得线段
与线段
的长度相等的情况?若存在,请直接写出线段
的长度;若不存在,请说明理由.
在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【初步思考】
(1)若点P落在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①当点P与点A重合时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
【深入探究】
(2)当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213a169e7fd26fcd32fb159bee2a3f91.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29224be6a2381b38bc64b144d26dad26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【拓展延伸】
(3)若点F与点C重合,点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
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名校
【推荐2】如图,在每个小正方形的边长均为
的方格纸中,线段
的端点
、
均在小正方形的顶点上,
为底边的等腰直角三角形
,点
在小正方形的顶点上;
(2)在图②中,作以
为一边的菱形
(四边形
不是正方形),点
、
在小正方形的顶点上;
(3)求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)在图②中,作以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb511e0a5d9918d382a1b811e290930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb511e0a5d9918d382a1b811e290930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)求菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb511e0a5d9918d382a1b811e290930.png)
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解答题-证明题
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适中
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【推荐1】如图①,正方形
的边长为5,点
为正方形
边上一动点,过点
作
于点
,将
绕点
逆时针旋转
得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/5b2f7615-41c4-473d-aa29-20f5cd8c0b8a.png?resizew=279)
(1)证明:
;
(2)如图②,延长
交
于点
.判断四边形
的形状,并说明理由.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fb768fc63e1aabddbfb2b3e7c5b51a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ee4a2510c4c5091513b3ab2dca6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc063cdcf722f07a1aa57be04edd416d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/5b2f7615-41c4-473d-aa29-20f5cd8c0b8a.png?resizew=279)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2126a94904c634b3964375574e7a21a2.png)
(2)如图②,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc063cdcf722f07a1aa57be04edd416d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43cae5a294aefb478de5532fea184ead.png)
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【推荐2】(1)解方程:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
(2)如图,在等边三角形
中,
,D是
上一点,且
,
绕点A旋转后得到
,求
的长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
(2)如图,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8ed2f1b67128a5a68abd2eeeef0231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/84d5778b-37e2-4cea-9535-e81f5209ded0.png?resizew=132)
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