1 . 如图,已知
是等边三角形,点B是边AD上一点,连接EB,将
绕点E顺时针旋转
,点D与点A重合,得到
,求证:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804605524770816/2805131166179328/STEM/81bf7592-f619-40ed-ab56-ed69a20866fd.png)
您最近一年使用:0次
名校
2 . 已知点
和点
在线段
上,且
,
,
,
和
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f9f588a9-01dd-47a4-9a72-063bddd6bf97.png?resizew=145)
求证:
;
当
,猜想
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f74a2f61d78627296fac510313d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7adadb7362f2aaad279414eea3de77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427e2f848323b4c156e7460ebf948009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae40bee64881b13f7ecde1b9433b291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a3a3d168a18401e47576f70a692e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28874ad3b1332d5121bea77e10dc1e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4553a3034f89da311519cd866a0a3cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f9f588a9-01dd-47a4-9a72-063bddd6bf97.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0239bdc32f5df40607674b81a82ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c019a078f28de50bfcb157087a2524ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2105c2f52ee73dbda37a571cbd16bdf.png)
您最近一年使用:0次
2021-01-09更新
|
176次组卷
|
4卷引用:江苏省盐城市明达初级中学2019-2020学年八年级上学期期中数学试题
江苏省盐城市明达初级中学2019-2020学年八年级上学期期中数学试题江苏省宿迁市钟吾初级中学2020-2021学年八年级上学期期中数学试题(已下线)练习7 全等三角形的性质及判定-2020-2021学年【补习教材·寒假作业】八年级数学(人教版)湖南省衡阳市外国语中学2021-2022学年八年级上学期第三次月考数学试题
3 . 如图,
,
,
,
在同一条直线上,
交
于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/2dc4370a-37ce-4759-ae3a-ea3e200d433e.png?resizew=213)
(1)求证:
.
(2)若
,
,试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/2dc4370a-37ce-4759-ae3a-ea3e200d433e.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5845bd851dd2bf1f64eba71b84c3ebc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea8d2436104194afbfb66c3fe9bbb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aab728de6cf843240a0b19d5249b108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
您最近一年使用:0次
4 . 如图,在
中,
,
是BC的中点,
于点E,
于点F.
(1)若
,求证:
是等边三角形;
(2)如果
,
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/761a77e11e1e45c2a8b2d34d22cf8e04.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0b4de7037d1917b0a964db6438df07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914a0f9a14fd49a938a90618cc5843e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
您最近一年使用:0次
5 . 如图,在□ABCD中,∠B=60°.
(1)作∠A的角平分线与边BC交于点E(用尺规作图,保留作图痕迹,不要求写作法);
(2)求证:△ABE是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/87713408-1f92-4715-a4ce-2c9496fd7cb7.png?resizew=219)
(1)作∠A的角平分线与边BC交于点E(用尺规作图,保留作图痕迹,不要求写作法);
(2)求证:△ABE是等边三角形.
您最近一年使用:0次
2020-07-17更新
|
270次组卷
|
2卷引用:广东省佛山市南海区2019-2020学年八年级下学期期末数学试题
6 . 如图平行四边形 ABCD 中,∠ABC=60°,点 E、F 分别在 CD、BC 的延长线上,AE∥BD,EF⊥BF,垂足为点 F,DF=2.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2473435565932544/2475775959212032/STEM/81c80310cf194933aa9b24e7fe1cb19b.png?resizew=135)
(1)求证:D 是 EC 中点;
(2)求 FC 的长.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2473435565932544/2475775959212032/STEM/81c80310cf194933aa9b24e7fe1cb19b.png?resizew=135)
(1)求证:D 是 EC 中点;
(2)求 FC 的长.
您最近一年使用:0次
7 . 已知:如图,AB=AD,∠B=∠D,∠1=∠2=60°,求证:AE=EC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/05a3085c-9cd5-4658-83ce-c983f4f55bb5.png?resizew=159)
您最近一年使用:0次
2019-12-15更新
|
139次组卷
|
2卷引用:湖北省黄冈市红安县2019-2020学年八年级上学期期中数学试题
8 . 如图,在
中,点
为边
的中点,过点
作射线
,过点
作
于点
,过点
作
于点
,连接
并延长,交
于点
.
![](https://img.xkw.com/dksih/QBM/2019/11/8/2333117393133568/2346674035236864/STEM/ef306368-46e0-4264-a477-39aead978800.png)
(1)求证:
;
(2)若
,求证:
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23e376ab222814e0029d2adb5a957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff68b481fdf58ab09bae9fdd7715be2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2019/11/8/2333117393133568/2346674035236864/STEM/ef306368-46e0-4264-a477-39aead978800.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eabe7f3dde8b6627330cfd927d2cbe1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85966c4b2a01a3a14cbb5fa3fb9177bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d21aa57d2f9370e4b4576723c5d613f.png)
您最近一年使用:0次
2019-12-02更新
|
243次组卷
|
9卷引用:江苏省江阴市长泾片2016-2017学年八年级上学期期中考试数学试题
江苏省江阴市长泾片2016-2017学年八年级上学期期中考试数学试题江苏省扬州市江都区真武中学等九校联谊2017-2018学年八年级上学期期中考试数学试题江苏省扬州市江都区邵樊片2017-2018学年八年级上学期期中考试数学试题四川省广安市岳池县2017-2018学年八年级上学期期中考试数学试题【校级联考】福建省厦门市五校2018-2019学年八年级上学期期中考试数学试题江苏省泰州市靖江市滨江学校2018-2019学年八年级上学期第一次月考数学试题江苏省苏州市昆山市、太仓市2019-2020学年八年级上学期期中数学试题2江苏省苏州市昆山市、太仓市2019-2020学年八年级上学期期中数学试题1重庆市重庆市重庆江北嘴实验学校2020-2021学年八年级上学期第三学月阶段性测试数学试题
9 . 在菱形
中,点
是对角线的交点,点
是边
的中点,点
在
延长线上,且
.
求证:
;
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182962025627648/2183446131228672/STEM/774398bf09384e859b666b10a1c4dcfb.png?resizew=309)
如果
,请写出图中所有的等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a7f1884593abfded963dda6ed3d95ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d151723aa1a6a8a52d8c5327011e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccc384823a4991e47ef387bdd5bd32b.png)
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182962025627648/2183446131228672/STEM/774398bf09384e859b666b10a1c4dcfb.png?resizew=309)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09446528b12dd384c6828e1ef1c70e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243a6e9e7ece8ef97bc98fb1dea0241d.png)
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182962025627648/2183446131228672/STEM/ac8c566a930f4fc3b69c6ab6eb75cce2.png?resizew=223)
您最近一年使用:0次
10 . 如图,在△ABC中,∠B=60°,过点C作CD∥AB,若∠ACD=60°,求证:△ABC是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/64163dad-ced5-4861-beda-7ef731286b3e.png?resizew=125)
您最近一年使用:0次
2019-02-12更新
|
1095次组卷
|
9卷引用:【市级联考】福建省厦门市2018—2019学年八年级(上) 质量检测数学试题
【市级联考】福建省厦门市2018—2019学年八年级(上) 质量检测数学试题福建省厦门市2018-2019学年八年级上学期期末数学试题福建省福州市平潭县综合实验区2019-2020学年八年级上学期期末数学试题福建省三明市大田县2018-2019学年八年级下学期期中数学试题(已下线)2020-2021学年八年级数学上册《单元测试定心卷》(人教版)第十三章 轴对称(能力提升)人教版2020-2021学年八年级上学期数学13.3.2等边三角形的性质与判定广西河池市南丹县2020-2021学年八年级上学期期中数学试题辽宁省大连市旅顺口区2021-2022学年八年级上学期期中数学试题陕西省安康市白河县2023-2024学年八年级上学期期末数学试题