1 . 如图1,在
中,
,
,点
是边
的中点,连接
,
,以点
为顶点作
,使
,
.
,
.线段
和线段
的数量关系为
,直线
和直线
的位置关系为 ;
(2)如图2,当
时,设
与
交于点
,求
的长度;
(3)当E,C,B在同一条直线上时,请直接写出
的长度.
![](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/8455657dde27aabe6adb7b188e031c11.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/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ee185e9bb7286ee3941033573fb355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edee9396bf4e1bc19f01dbd836e34d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)当E,C,B在同一条直线上时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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5卷引用:2023年吉林省实验学校中考数学三模模拟试题
2 . 【问题呈现】
和
都是直角三角形,
,
,
,连接
、
,探究
、
的位置关系.
【问题探究】
(1)如图①,当
时,判断
、
的位置关系,并说明理由.
(2)如图②,当
时,
、
的位置关系为______.
【拓展应用】
(3)当
,
,
时,将
绕点C旋转、使A,D,E三点恰好在同一直线上,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99100a3ec33eecf804076f76c905359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4818e07559cd9ec3810dcb4d0cdb6a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
【问题探究】
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
【拓展应用】
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4590b1db8451f30e1021e68b8359c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a88770433e9897d78d28ccfaab8b506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/617a843d-cc61-479e-b34a-9ea7cac75f7f.png?resizew=791)
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3 . 如图①,如图,在正方形
中,点
为
边上一点,连接
,点
为
的中点,过点
作
于点
,连接
,
.
观察猜想:
(1)
与
的数量关系是_____________;
和
的数量关系是_____________;
探究发现:
(2)将图①中的
绕点
逆时针旋转,使点
恰好落在
上,此时点F还是
的中点.线段
绕点
旋转
得到线段
,连接
,
,
,如图②所示,探究
和
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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827beb23a9fe02a8b588645bcb82ce67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
观察猜想:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752834fbad4d6e33fb85930309b17aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00292f271533527c6c77ae77dd86075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
探究发现:
(2)将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b31d7cff6b825f7abd8765e4cb289e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/6760d0fa-14c9-466c-b476-264baab4a327.png?resizew=342)
您最近一年使用:0次
名校
4 . 如图,在
中,
,用直尺和圆规作图,
交
于点
,根据作图痕迹,下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073a36e4da640a6541c3af0d2d9a49ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-03-03更新
|
140次组卷
|
3卷引用:吉林省长春市绿园区新解放学校2023-2024学年九年级上学期期末数学试题
5 . 如图,正方形
的边长为6,点
,
分别在
,
上,
,连接
、
,
与
相交于点
,连接
,取
的中点
,连接
,则的
长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/14e9595f-f5e0-4422-8a79-b3ee4606dff3.png?resizew=127)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7272cdbb0e90de66a78830fe199db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/14e9595f-f5e0-4422-8a79-b3ee4606dff3.png?resizew=127)
A.2.5 | B.![]() | C.5 | D.![]() |
您最近一年使用:0次
名校
6 . 如图①,点在线段
上
点
不与
,
重合
,分别以
,
为边在
同侧作等边三角形
和等边三角形
,连接
,
交于点
.
(1)观察猜想:
①与
的数量关系为 .
②的度数为 ;
(2)数学思考:
如图②,当点在线段
外时,
中的结论①,②是否仍然成立?若成立,请给予证明;若不成立,请你写出正确结论再给予证明.
(3)拓展应用:
如图③,点为四边形
内一点,且满足
,
,
对角线
,
交于点
,
,则四边形
的面积为 .
您最近一年使用:0次
2024-02-21更新
|
134次组卷
|
16卷引用:2019年吉林省长春市中考零模数学试题
2019年吉林省长春市中考零模数学试题吉林大学附属中学2019-2020学年九年级下学期疫情期间网课质量检测数学试题2021年吉林省松原市乾安县初中毕业生学业水平模拟考试数学试题2022年吉林省吉林市大学区中考第五次联考数学试题(A卷)(一模)吉林省松原市四校联考2022-2023学年九年级上学期期中数学试题吉林省松原市前郭尔罗斯蒙古族自治县前郭县白依拉嘎乡中学等3校2022-2023学年九年级上学期期中数学试题2024年吉林省四平市第三中学校中考模拟预测数学模拟预测试题广东省中山市华侨中学2023-2024学年九年级上学期期中数学试题【市级联考】河南省洛阳市2018-2019学年八年级(上)期末数学试卷江西省宜春市丰城市2019-2020学年八年级上学期期末数学试题河南省洛阳市第二外国语学校2021-2022学年八年级上学期开学考试数学试题山西省晋中市介休市第三中学校2020-2021学年八年级下学期第一次月考试题数学试题(已下线)专题12 共定点等边三角形的六大结论及应用-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)四川省广元市苍溪县东溪、元坝、歧坪、五龙、陵江片区2022-2023学年八年级上学期期中联考数学试题江西省赣州市章贡区第三中学2022-2023年八年级数学上学期期末质量检测试题河南省信阳市罗山县2023-2024学年八年级上学期期末数学试题
7 . 如图,等边三角形
内一点D,将线段
绕点A逆时针旋转
,得到线段
,连接
.
的形状__________,并写出判断的依据__________;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e40a2152300b3cb13a140b0b9f3b467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40325f795848186679f7afd200916b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
您最近一年使用:0次
2024-02-09更新
|
38次组卷
|
3卷引用:吉林省吉林市丰满区第二十七中学校2023-2024学年九年级上学期期末数学试题
吉林省吉林市丰满区第二十七中学校2023-2024学年九年级上学期期末数学试题(已下线)第三章第04讲 难点探究专题:旋转中的常见类型(5类热点题型讲练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(北师大版)山东省菏泽市东明县2023-2024学年八年级下学期期中数学试题
解题方法
8 . 如图,在
中,
,以
为边在
的另一侧作
,点
为边
(不含端点)上的任意一点,在射线
上截取
,连接
. 设
与
交于点
,则线段
的最大值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a25eefb9fd50a979c924519f978b233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4beb71587d214c3bc47e393149177c5a.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/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ddf9eca1dbd3fdd7b17fc81ae6a9bc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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8卷引用:2024学年吉林省四平市铁东区实验中学九年级中考数学模拟预测题
2024学年吉林省四平市铁东区实验中学九年级中考数学模拟预测题山东省淄博市临淄区临淄区实验中学2023-2024学年九年级上学期期末数学试题2024年山东省泰安市新泰市中考数学第一次模拟试题2024学年 山东省泰安市新泰市九年级上学期第一次模拟数学模拟试题(五四制)2024年山东省泰安市泰山实验中学中考数学模拟预测题(3月份)2024年山东省德州市齐河县九年级中考一模数学试题(已下线)重难点06 相似三角形模型及其压轴类型(8大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(广东专用)2024年山东省德州市齐河县九年级下学期第一次练兵考试数学试题
9 . 如图,已知
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://img.xkw.com/dksih/QBM/2023/12/21/3394185412993024/3417137587298304/STEM/97b7fdfad6be483e9b29865b75579784.png?resizew=131)
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3卷引用:2023年吉林省松原市扶余一实验学校、扶余二实验学校中考数学三模试题
10 . 两个大小不同的等边三角形三角板按图①所示摆放.将两个三角板抽象成如图②所示的△
和△
,点B、C、D依次在同一条直线上,连接
.若
,
,则点A到直线
的距离为 _______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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5卷引用:2023年吉林省长春市中考一模数学试题
2023年吉林省长春市中考一模数学试题2023年吉林省长春市初中学业水平考试网上阅卷模拟练习数学模拟预测题吉林省长春市宽城区2023-2024学年八年级上学期期末数学试题(已下线)重难点02+三角形与特殊三角形2(已下线)培优冲刺01 三角形中的常见模型综合训练(14模型)-【查漏补缺】2024年中考数学复习冲刺过关(全国通用)