名校
1 . 如图,在
中,
,
,
是
由绕点
顺时针旋转
得到,连接
,将
绕点
逆时针旋转
得到
,连接
.
;
(2)若
是等腰三角形,直接写出
的度数;
(3)当
三点共线时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f02cc86b7b971df364fdf47a0e75f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba83afe4ade6624b283331a18bdf2ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa15de8ed6842d6fd51176b51f4844da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6369cd1db768436809404b1f3c4132c0.png)
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2 . 如图,在四边形
中,
,
,点E为四边形
内一点,连接
、
、
,若
,则CE的最小值为______ .(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bce559fceb4731f8d4323410075a22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef9c8b87d1f6ca98d4b2d048faa41e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9c56010f999e29699ef7f1e7fdb172.png)
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名校
3 . 已知,如图,在正方形
中,点
分别是边
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/9/c1a1d3e5-6cdc-412c-9c15-d01bbbf87796.png?resizew=429)
(1)如图1,若
,垂足为
,求证:
;
(2)如图2,点
是边
上一点,且
,垂足为
.
①判断
与
是否相等?并说明理由;
②如图3,若
垂直平分
,交对角线
交于点
,写出线段
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/9/c1a1d3e5-6cdc-412c-9c15-d01bbbf87796.png?resizew=429)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de97dfb4a50e1e852ac0d09c3605d1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d92c236d15ca9003d00dd5587599fe3.png)
您最近一年使用:0次
2023-08-06更新
|
449次组卷
|
2卷引用:福建省龙岩市第二中学2022-2023学年八年级下学期期中数学试题
名校
4 . 如图,如图正方形
内一点E,满足
为正三角形,直线AE交BC于F点,过E点的直线
,交AB于点G,交CD于点H.以下结论:①
;②
;③
;④
,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/14/265febe0-fb55-4558-aeab-29f98bae3fc7.png?resizew=155)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf9cef313e54fceed486d77948e18c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf85bde8166fc6450e621ec66fe1d3b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f15bfd030c5d4b9cbe79cb76fd62ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2252ed759e292416d6d73bd9e527ed5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d669b274ebdb8034300a193dbde86e1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/14/265febe0-fb55-4558-aeab-29f98bae3fc7.png?resizew=155)
A.①②③ | B.①③④ | C.①④ | D.①②③④ |
您最近一年使用:0次
2021-05-07更新
|
641次组卷
|
5卷引用:2021年广东省深圳市南山区中考二模数学试卷
2021年广东省深圳市南山区中考二模数学试卷(已下线)专题28.12 《锐角三角函数》全章复习与巩固(培优篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)2022年广东省东莞市石龙第三中学九年级下学期数学一模试题山东省青岛市市南区2020-2021学年九年级上学期期中数学试题广东省河源市河源中学实验学校2023-2024学年九年级下学期第一次月考数学试题
20-21九年级·全国·假期作业
名校
解题方法
5 . 如图,已知在正方形
中,对角线
与
交于点
,点
在线段
上,连结
并延长交边
于点
,点
在线段
上,且
,连结
与线段
交于点
,连结
、
.
(1)求证:
;
(2)如果
,求证:四边形
是菱形;
(3)如果
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e7d95578c9ba65c367d33948b6f4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ff398bdaa4eb5a274f86c0d8b77ef2.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96f877b3a32b1459bf2054e657694a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44716bbdc4b913f60470ca02350db35.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b02bd90946c4b02a4ce6e85d07c229e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411258fbcb570e57074975db63ff1a8a.png)
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635020683935744/2635241193979904/STEM/472b77211a75429fa123aff805ab238f.png?resizew=283)
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6 . 如图1,在正方形ABCD中,点F为对角线BD上一点,FE⊥AB于点E,将△EBF绕点B逆时针旋转到图2所示的位置,连接AE、DF,则在图2中,有以下说法:①FD=
AE;②∠AEB= 135°;③
=1:2;④AE∥BF,其中正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/2020/12/28/2623840947838976/2624453254348800/STEM/127f9213-5e0c-489f-b715-37515e1a12a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962f6afcf6c1a694c142a20675317c43.png)
![](https://img.xkw.com/dksih/QBM/2020/12/28/2623840947838976/2624453254348800/STEM/127f9213-5e0c-489f-b715-37515e1a12a8.png)
A.①② | B.①③ | C.②③ | D.③④ |
您最近一年使用:0次
2020-12-29更新
|
678次组卷
|
2卷引用:山东省德州市宁津县育新中学2020-2021学年九年级上学期第二次月考数学试题
7 . 如图,点
是正方形
内一点,
,
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599807029288960/2600318892883968/STEM/d34ebe5e-7ae0-4508-9dac-2b44ee74c4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feedf3c1dee6e7befebf368c092ccd0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fddda9e7f4d7140bf357d76c9e23d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599807029288960/2600318892883968/STEM/d34ebe5e-7ae0-4508-9dac-2b44ee74c4c3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-11-24更新
|
2508次组卷
|
2卷引用:黑龙江省佳木斯市第十九中学2020-2021学年九年级上学期期中数学试题
8 . 如图,正方形ABCD中,AB=6,G是BC的中点.将△ABG沿AG对折至△AFG,延长GF交DC于点E,求DE的长
![](https://img.xkw.com/dksih/QBM/2020/11/14/2592801614667776/2597129219424256/STEM/00863d1ac5704db49b0a3f8d9148f956.png?resizew=76)
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名校
9 . 如图,四边形ABCD中,AD∥BC,∠ABC+∠DCB=90°,且BC=2AD,以AB、BC、DC为边向外作正方形,其面积分别为
、
、
,若
=3,
=8,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2020/11/4/2585606723166208/2588357914853376/STEM/d773973b7d284306a9367dc59d08b698.png?resizew=135)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2020/11/4/2585606723166208/2588357914853376/STEM/d773973b7d284306a9367dc59d08b698.png?resizew=135)
A.22 | B.24 | C.44 | D.48 |
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2020-11-08更新
|
828次组卷
|
3卷引用:江苏省常州市星辰实验中学2020-2021学年八年级上学期第一次月考数学试题
10 . 如图,O为
的对称中心,对角线
,过点O作直线EF分别交AD,BC于E,F,连接AF,CE.
![](https://img.xkw.com/dksih/QBM/2020/10/29/2581417968820224/2585551002828800/STEM/79802afa-115d-4bce-81d2-523612f41007.png)
(1)证明:四边形AFCE是平行四边形;
(2)若给出下列四个条件:①AC=EF;②
;③AE=DE;④
,请你从中添加一个条件,使四边形AFCE是菱形,这个条件可以为______(填序号);
(3)若四边形AFCE是正方形,求BC与AB间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://img.xkw.com/dksih/QBM/2020/10/29/2581417968820224/2585551002828800/STEM/79802afa-115d-4bce-81d2-523612f41007.png)
(1)证明:四边形AFCE是平行四边形;
(2)若给出下列四个条件:①AC=EF;②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
(3)若四边形AFCE是正方形,求BC与AB间的数量关系.
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