如图1,在
中,
,
,点D,E分别在边
,
,连接
,
,点F是线段
中点,连接
交
于点H.
与
的数量关系是 ______,位置关系是_____;
(2)探究证明:把
处点C逆时针旋转α
.如图2,请问(1)中的结论是否仍然成立?请说明理由
(3)拓展延伸∶把
绕点C旋转,当点D旋转到直线
上时,连接
,试探究
与
、
之间有怎样的数量关系?
![](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/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)探究证明:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab5549e57dcadd5377ab85b6cf29986.png)
(3)拓展延伸∶把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
22-23八年级下·四川成都·期中 查看更多[2]
四川省成都市锦江区成都金苹果锦城第一中学2022-2023学年八年级下学期期中数学试题(已下线)八年级数学期末必刷题03(压轴题,40题11种题型)-2023-2024学年八年级数学下学期期末考点大串讲(苏科版)
更新时间:2024-04-01 21:05:22
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解答题-证明题
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【推荐1】已知
为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/d574747f-db95-45f9-b621-05388efe83c8.png?resizew=475)
(1)如图1,点D为边
上一点,以
为边作等边三角形
,连接
,求证:
.
(2)如图2,以
为腰作等腰直角三角形
,取斜边
的中点E,连接
,交
于点F.求证:
.
(3)如图3,若
,点P是边
上一定点且
,若点D为射线
上一动点,以
为边向右侧作等边
,连接
、
,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/d574747f-db95-45f9-b621-05388efe83c8.png?resizew=475)
(1)如图1,点D为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b83407b7a590f1529162e79b8073a62.png)
(2)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780e14ebf1efe725b819b1ff2575b9d.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74297e527405c91ffbeb6b9c95a9643c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d06fad1ed5a452a835e9a02cb011ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273ae14ed527f0c2710f5760b02e764a.png)
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【推荐2】(1)初步探究:
如图1,
为等腰直角三角形,
,点D为边
上一点,以
为边作等腰直角三角形
,且
,连接
.若
,
,求
的面积.
为一个艺术演艺规划区域,
.在正方形
内部或边上,作如下规划:点B为入口,点E为
中点,点F在边
上,
为演员化妆区,
;点P在
上,
,点Q在
上,等边
为表演舞台,
和
为观看区域.请问观看区域
和
面积之和是否为定值?如是,说明理由并求出定值;如不是,说明理由.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e3b8b36fc31644f5e121300645befc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a165f441db0e5fb0b855f133bcc934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c00ad393320c32156821dc8c7f0933a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1c1d74084e646eb60c0e5fd7688574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a83962deb4bd64a8ddc85f7009c0d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812c1c4c8187ed8775781beee88f2eb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812c1c4c8187ed8775781beee88f2eb2.png)
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【推荐1】定义:有一组邻边垂直且对角线相等的四边形为垂等四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/aaabfcc9-b475-4a73-b84f-772e37067e5e.png?resizew=585)
(1)在①平行四边形②矩形③菱形中,是垂等四边形的是______.(填序号)
(2)如图1,在
方格纸中,A,B,C在格点上,请画出两个符合条件的不全等的垂等四边形,使
、
是对角线,点D在格点上.
(3)如图2,在正方形
中,点E、F、G分别在
上,
且
,求证:四边形
是垂等四边形.
(4)如图3,已知
,
,
,
,以
为腰且在
的右上方作等腰三角形,使四边形
是垂等四边形,请直接写出四边形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/aaabfcc9-b475-4a73-b84f-772e37067e5e.png?resizew=585)
(1)在①平行四边形②矩形③菱形中,是垂等四边形的是______.(填序号)
(2)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e329a94337ada7c88a4fad9b92f0eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
(3)如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac8f75bb1b40585f3094793e17ac21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7e61d33182d4e8c35e634773c3f778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad319b3dfafad097f8ef014d97c6a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
(4)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8575912bebb3106ad40918ad4c30bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cca121a2e8b03262a1e8b2508f1c6f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
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【推荐2】如图,在
中,
,
,
,
是三角形的角平分线;
是边
上的动点,
于
,交
于
,
、
分别交
于
、
.
(1)如果
是等腰三角形,求
的长;
(2)以
为圆心、
长为半径作
,再以
为圆心、
为半径作
.如果
与
相切,求
的长;
(3)在点
的运动过程中,
是否可能与
相似?如果能相似,求此时
的长;如果不能相似,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4cec8a7b87c2bc9fb135eadb7aa5c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a81c5699a01b6b12b16ff9bce6d6ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/a1928a21fbe0b3ccc567a2e406addc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/7674894c-5924-46c6-a0fc-fca5f8f21c79.png?resizew=472)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐1】【综合与实践】综合实践课上,老师带领同学们研究“菱形背景下的旋转问题”.
问题情境:在菱形
中,
为边
上一点(与A,D不重合),连接
,并将射线
绕点
在平面内顺时针旋转,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/2c91a7d6-7e8e-400a-b9a4-d5d96bf551be.png?resizew=148)
操作感知:(1)小华取
,如图1,射线
与射线
交于点
,请你帮小华同学补全下面两个问题的答案:①线段
与
的数量关系是________________;②线段
的数量关系是________________.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/59a176ae-6f62-4c42-9e80-2f3e65624e6e.png?resizew=269)
猜想论证:(2)小夏取
,如图1,射线
与射线
交于点
,小夏在笔记本上记录了自己的思考过程:
线段
与
的数量关系与(1)①相同……
但线段
的数量关系好像不再成立……
我发现线段
之间好像具有与(1)②类似的数量关系......
请你帮小夏同学完成线段
之间数量关系的猜想并给出证明.
拓展探究:(3)小梦测量得到
,如图2,在旋转过程中,设点
的对应点为
,当点
落在菱形
的边或对角线所在直线上时,记点
到直线
的距离为
,请你帮小梦同学直接写出所有大于
的
的值.
问题情境:在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa6f89ea44f721efc1418904dd5a389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335c1d4db7d83b1271c2d6ff87a24b6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/2c91a7d6-7e8e-400a-b9a4-d5d96bf551be.png?resizew=148)
操作感知:(1)小华取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cecf746d5eb0739284b23b93c110a4.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f32057b5f0a6a714f3a88840a768b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/59a176ae-6f62-4c42-9e80-2f3e65624e6e.png?resizew=269)
猜想论证:(2)小夏取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
但线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f32057b5f0a6a714f3a88840a768b5.png)
我发现线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e649b64028bec83175b06b5d91944cdd.png)
请你帮小夏同学完成线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e649b64028bec83175b06b5d91944cdd.png)
拓展探究:(3)小梦测量得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63f5f19918847da9f8ea0fb04ff616.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】如图,在
中,
,
,点
在直线
上运动,连接
,以
为斜边在直线
的右侧作
,其中
,
.
(1)如图1,点
运动到点
的左侧时,
与
相交于点
,当
平分
时,若
,求
的长;
(2)如图2,点
沿射线
方向运动过程中,当
时,连接
,过点
作
交
的延长线于点
,取
的中点
,连接
.求证:
;
(3)如图3,点
沿射线
方向运动过程中,连接
,将线段
绕点
顺时针方向旋转
,得到线段
,连接
、
.若
,当
取得最小值时,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10b6175fb056760a9357936d14ffe82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf14bc3bfe884ddfff067ba7f410b31.png)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/2765ca49-09f7-47e7-a542-36448e251b3d.png?resizew=121)
(2)如图2,点
![](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/c4dd6e7c88601b4c50b06f1238fdd95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd8f551c92c15ad3bb09f9aa470496b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167a8be856089e9f87808fae089747aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/de39d964-6419-4637-973f-81f70d200264.png?resizew=195)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01cc040ee53c1db5150eb6403dd5359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/052ee630-0bf8-477a-884e-8b22301e10c6.png?resizew=110)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】问题探究
将几何图形按照某种法则或规则变换成另一种几何图形的过程叫做几何变换.旋转变换是几何变换的一种基本模型.经过旋转,往往能使图形的几何性质清晰显现.题设和结论中的元素由分散变为集中,相互之间的关系清楚明了,从而将求解问题灵活转化.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/1193ae9c-065e-4568-9f61-621a2a7bab8a.png?resizew=381)
【问题提出】如图1,点P是等边△ABC内的一点,PA=5,PB=12,PC=13.你能求出∠APB的度数吗?
【问题解决】如图2,将△BPC绕点B逆时针旋转60°,得到△BP′A,连接PP′,可得△BPP′是等边三角形,根据勾股定理逆定理可得△AP′P是直角三角形,从而使问题得到解决.
(1)结合上述思路完成填空:PP′=________,∠APP′=________
,∠APB=________
;
(2)【类比探究】如图3,若点P是正方形ABCD内一点,PC=1,PB=2,PA=3,则∠CPB=________
;
(3)如图4,若点P是正方形ABCD外一点,且PA=13,
,PC=3,则∠CPB=_____
;
(4)【深入探究】如图5,若在正六边形ABCDEF内有一点P,且PA=5,
,PC=3,则∠CPB=________
;
(5)如图6,在△ABC中,∠BAC=30°,AB=12,AC=5,P为△ABC内部一点,连接PA、PB、PC,则PA+PB+PC的最小值是_______.
将几何图形按照某种法则或规则变换成另一种几何图形的过程叫做几何变换.旋转变换是几何变换的一种基本模型.经过旋转,往往能使图形的几何性质清晰显现.题设和结论中的元素由分散变为集中,相互之间的关系清楚明了,从而将求解问题灵活转化.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/1193ae9c-065e-4568-9f61-621a2a7bab8a.png?resizew=381)
【问题提出】如图1,点P是等边△ABC内的一点,PA=5,PB=12,PC=13.你能求出∠APB的度数吗?
【问题解决】如图2,将△BPC绕点B逆时针旋转60°,得到△BP′A,连接PP′,可得△BPP′是等边三角形,根据勾股定理逆定理可得△AP′P是直角三角形,从而使问题得到解决.
(1)结合上述思路完成填空:PP′=________,∠APP′=________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)【类比探究】如图3,若点P是正方形ABCD内一点,PC=1,PB=2,PA=3,则∠CPB=________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(3)如图4,若点P是正方形ABCD外一点,且PA=13,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b191909cc8153b5f965898cfa67a25b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(4)【深入探究】如图5,若在正六边形ABCDEF内有一点P,且PA=5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae457131431efa8107ab4db6513362d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(5)如图6,在△ABC中,∠BAC=30°,AB=12,AC=5,P为△ABC内部一点,连接PA、PB、PC,则PA+PB+PC的最小值是_______.
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】已知
和
均为等腰直角三角形,其中
,
,
,
,连接
,点F是
的中点,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/305a8e98-924c-4871-b2d2-274e4bf596cf.png?resizew=351)
(1)如图,点E在线段
上,且
,
,求线段
的长;
(2)如图,连接
,求证:
;
(3)如图,
,
,将
绕着点B逆时针旋转,将线段
沿直线
翻折得到线段
,连接
,当CF最大时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7812fb18d08020f2d6c2633dc79b8ac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/305a8e98-924c-4871-b2d2-274e4bf596cf.png?resizew=351)
(1)如图,点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f5e7c48a7b9992cdc8234e3df2f7a7.png)
(3)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】在锐角△ABC中,AB=AC,D是线段BC上的一点,连接AD,将AD绕着点A顺时针旋转至AE,使得∠EAD=2∠BAC,连接DE交AB于点F.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853710348279808/2855943578214400/STEM/ddff16b1b329447b972e7b6d55e95331.png?resizew=532)
(1)如图1,若∠BAC=60°,∠DAC=15°,BD=4,求AB的长;
(2)如图2,点G是线段AC的一点,连接DG,FG,若DA平分∠EDG,求证:FE=DG+FG;
(3)在(1)的条件下,将△BFD绕D点顺时针旋转∠α(0°<α<180°)得△B'F'D,直线B'F'交AB于点M,交AC于点N.在旋转过程中,是否存在△AMN为直角三角形?若存在,请直接写出AM的长度;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853710348279808/2855943578214400/STEM/ddff16b1b329447b972e7b6d55e95331.png?resizew=532)
(1)如图1,若∠BAC=60°,∠DAC=15°,BD=4,求AB的长;
(2)如图2,点G是线段AC的一点,连接DG,FG,若DA平分∠EDG,求证:FE=DG+FG;
(3)在(1)的条件下,将△BFD绕D点顺时针旋转∠α(0°<α<180°)得△B'F'D,直线B'F'交AB于点M,交AC于点N.在旋转过程中,是否存在△AMN为直角三角形?若存在,请直接写出AM的长度;若不存在,请说明理由.
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】在平面直角坐标系
中,已知点
,A为坐标系中任意一点.现定义如下两种运动:P运动:将点A向右平移
个单位长度,再向上平移
个单位长度,得到点
,再将点
绕点O逆时针旋转
,得到点
;
Q运动:将点A绕点O逆时针旋转
,得到点
,再将点
向右平移
个单位长度,再向上平移
个单位长度,得到点
.
(1)如图,已知点
,
,点A分别经过P运动与Q运动后,得到点
,
.
①若
,请你在下图中画出点
,
的位置;
,求m的值.
(2)已知
,点A,B分别经过P运动与Q运动后,得到点
,
与点
,
,连接
,
.若线段
与
存在公共点,请直接写出此时线段
长度的取值范围(用含有t的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc5dd4d07e2098d8d1b731f2622867f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1fa48602cf15bf3c6483a8d27beae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef2b5ae8b0eb29a44a3db2b2be45477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
Q运动:将点A绕点O逆时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1fa48602cf15bf3c6483a8d27beae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef2b5ae8b0eb29a44a3db2b2be45477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
(1)如图,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26e951d6d2369e8da79a793a93a66a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8649ce18c628d0e03e72cef541f8284f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013a9d8ab25a70d979be815dd02322fb.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b6269558518a9e0446c9f0f4c6d2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34876d748f30fa4fc2eb6a686b5ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34876d748f30fa4fc2eb6a686b5ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
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