1 . 如图1是意大利著名画家达·芬奇(
,1452~1519年)的名画《蒙娜丽莎》.画面中脸部被围在矩形
内,眉毛到下巴的面部正好围在正方形
中,剩余的矩形
~矩形
,抽象出的图形如图2所示,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ad94bafeb1e9bcd2246b40cc12957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/26c39215-e87c-48fc-bc78-f97b9e82caff.png?resizew=363)
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2 . 如图,某小区有甲、乙两座楼房,楼间距BC为50米,在乙楼顶部A点测得甲楼顶部D点的仰角为37°,在乙楼底部B点测得甲楼顶部D点的仰角为60°,则甲、乙两楼的高度分别为多少?(结果精确到1米,sin37°≈0.60,cos37°≈0.80,tan37°≈0.75,
≈1.73)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/9861307b-be06-440e-b41e-bbea04bc00d4.png?resizew=152)
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2020-01-08更新
|
873次组卷
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9卷引用:2020年1月河南省郑州市一摸数学试题
3 . 如图,在△ABC中,AB=AC,D,E是△ABC内的两点,AD平分∠BAC,∠EBC=∠E=60°.若BE=9cm,DE=3cm,则BC的长为 ( )
![](https://img.xkw.com/dksih/QBM/2019/11/16/2335048142528512/2335881995935744/STEM/c7c2a9bf6567427389e4e7f2f50c84f5.png?resizew=83)
![](https://img.xkw.com/dksih/QBM/2019/11/16/2335048142528512/2335881995935744/STEM/c7c2a9bf6567427389e4e7f2f50c84f5.png?resizew=83)
A.12cm | B.11cm | C.9cm | D.6cm |
您最近一年使用:0次
2019-11-23更新
|
92次组卷
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2卷引用:河北省邢台市临城2019-2020学年八年级上学期期中数学试题
4 . 如图,在矩形
中,
,
,对角线
的垂直平分线分别交
、
于点
、
,连接
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2019/11/20/2338129018363904/2339618108653568/STEM/ab4eb9a7563043a9b5ac87963ba3137a.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2019/11/20/2338129018363904/2339618108653568/STEM/ab4eb9a7563043a9b5ac87963ba3137a.png?resizew=164)
A.6 | B.7 | C.5 | D.5.6 |
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18-19八年级下·浙江·阶段练习
5 . 如图,矩形
中,
,点
是
上的一点,有
,
的垂直平分线交
的延长线于点
,连结
交
于点
,若
是
的中点,
,则
的长是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50501957509dd273164968ad30a50f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333008145154048/2333096353357824/STEM/43808a83299644a0a15479c0f7f85468.png?resizew=144)
您最近一年使用:0次
真题
名校
6 . 如图,在矩形ABCD中,对角线AC的中点为O,点G,H在对角线AC上,AG=CH,直线GH绕点O逆时针旋转α角,与边AB、CD分别相交于点E、F(点E不与点A、B重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/5f8f44c8-b41d-4ebc-8ffa-aba79ccab4b5.png?resizew=271)
(1)求证:四边形EHFG是平行四边形;
(2)若∠α=90°,AB=9,AD=3,求AE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/5f8f44c8-b41d-4ebc-8ffa-aba79ccab4b5.png?resizew=271)
(1)求证:四边形EHFG是平行四边形;
(2)若∠α=90°,AB=9,AD=3,求AE的长.
您最近一年使用:0次
2019-10-29更新
|
2372次组卷
|
22卷引用:山东省日照市2019年中考数学试题
山东省日照市2019年中考数学试题山东省日照市莒县第三协作区2019-2020学年九年级上学期11月月考数学试题苏科版八年级下册9.4矩形同步练习(已下线)考点22 图形的轴对称、平移与旋转《备战2020年中考数学考点 核心考点清单》(已下线)专题11 四边形问题-决胜2020年中考数学压轴题全揭秘精品人教版2020年九年级上数学 第二十三章 旋转 全章综合练习湖北省宜昌市西陵区第九中学2020-2021学年九年级上学期期中数学试题四川省德阳市旌阳区德阳中学校2020-2021学年八年级上学期期中数学试题辽宁省沈阳市第一三四中学2021-2022学年九年级上学期期中数学试题(已下线)专题23.5 中心对称(基础篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)第05课 特殊平行四边形 解答题(重点)-2022-2023学年九年级数学上册课后培优分级练(北师大版)山东省淄博市沂源县2021-2022学年八年级下学期期中数学试题(已下线)综合复习与测试(全册)(1)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)辽宁省沈阳市和平区沈阳铁路实验中学2022-2023学年九年级上学期第三次月考数学试题江苏省常州市天宁区北郊初级中学2020-2021学年八年级下学期期中数学试题(已下线)专练04 特殊平行四边形解答题综合(练习)-2022-2023学年八年级数学下册同步精品课堂(苏科版)(已下线)期中模拟预测卷02(测试范围:第7章~第10章)-【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)(已下线)专题23.10 中心对称(直通中考)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题23.11 旋转(全章知识梳理与考点分类讲解)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题23.15 旋转(直通中考)(全章基础练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题9.17 矩形(直通中考)(基础练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)江苏省泰州市靖江市滨江学校2023-2024年八年级下学期第一次月考数学试题
7 . 如图,已知矩形ABCD的对角线AC的长为10cm,连结矩形各边中点E、F、G、H得四边形EFGH,则四边形EFGH的周长为( )cm.
![](https://img.xkw.com/dksih/QBM/2019/10/20/2316086031572992/2316227272089600/STEM/a9cd661d-0d68-4f23-9965-06c5b6a19698.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/2019/10/20/2316086031572992/2316227272089600/STEM/a9cd661d-0d68-4f23-9965-06c5b6a19698.png?resizew=162)
A.20 | B.![]() | C.![]() | D.25 |
您最近一年使用:0次
2019-10-20更新
|
328次组卷
|
5卷引用:四川营山小桥中学2018-2019学年度下期八年级期末教学质量监测数学试题
四川营山小桥中学2018-2019学年度下期八年级期末教学质量监测数学试题浙江省嘉兴市嘉兴一中实验学校2018-2019学年八年级下学期期中数学试题(已下线)【万唯原创】矩形、菱形、正方形·满分特训(一)浙江省绍兴市越城区建功中学2019-2020学年八年级下学期期中数学试题(已下线)【新东方】【2021.5.25】【NB】【初二下】【数学】【NB00027】
8 . 如图,在Rt△ABC中,∠A=90°,AB=3,AC=4,P为边BC上一动点,PE⊥AB于E,PF⊥AC于F,则EF的最小值为( )
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309776263938048/2314096929677312/STEM/c5a09960798b4fef99288ba792f03eca.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2019/10/11/2309776263938048/2314096929677312/STEM/c5a09960798b4fef99288ba792f03eca.png?resizew=152)
A.2 | B.2.4 | C.2.5 | D.2.6 |
您最近一年使用:0次
9 . 如图,矩形
中,点
分别在边
与
上,点
在对角线
上,
,
.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313165767507968/2314088337506304/STEM/e9e9360ff90b479581a74959569b7d41.png?resizew=188)
求证:四边形
是平行四边形.
若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af99797a4b66560829f0eaf800627746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6baf820ff60f2015ae352f2b1bc3aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313165767507968/2314088337506304/STEM/e9e9360ff90b479581a74959569b7d41.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9b74a6609450a154847baa28fe0382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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2019-10-17更新
|
185次组卷
|
2卷引用:河南省长葛市2018-2019学年八年级下学期期末考试数学试题
名校
10 . 如图,矩形ABCD中,对角线AC、BD交于点O.若∠AOB=60°,BD=10,则AB的长为( )
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294085135343616/2294597903179776/STEM/5efbd19cf8354540907a50645fcd0ed2.png?resizew=159)
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294085135343616/2294597903179776/STEM/5efbd19cf8354540907a50645fcd0ed2.png?resizew=159)
A.5![]() | B.5 | C.4 | D.3 |
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2019-09-20更新
|
284次组卷
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5卷引用:2019年陕西省商洛市商南二中中考三模数学试题