如图,在四边形ABCD中,AD=AB=BC,AC⊥BD交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/528697d8-4465-4560-bd00-f94e95b01434.png?resizew=495)
(1)求证:四边形ABCD为菱形;
(2)如图2,过四边形
的顶点A作
于点
,交
于点
,若
,求四边形
的面积;
(3)如图3,过菱形
的顶点A作
,且
,线段
交
于点
,交BC于点
,若
、
、
三点共线,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/528697d8-4465-4560-bd00-f94e95b01434.png?resizew=495)
(1)求证:四边形ABCD为菱形;
(2)如图2,过四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca5accc7df8598f68d2d6cb50f79a7.png)
(3)如图3,过菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4e363bfd418579e6229230df034bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fba21c8237b4cefec6e226dab7234b.png)
21-22八年级下·福建莆田·期中 查看更多[5]
福建省莆田市荔城区莆田砺志学校、中山中学2021-2022学年八年级下学期期中联考数学试题(已下线)第18章 平行四边形 单元综合检测(重点)(练习)-2022-2023学年八年级数学下册同步精品课堂(人教版)(已下线)18.2.2 菱形(含2个课时)(练习)-2022-2023学年八年级数学下册同步精品课堂(人教版)(已下线)专练02 菱形解答证明题(练习)-2022-2023学年八年级数学下册同步精品课堂(人教版)(已下线)数学(福建专用A卷)-学易金卷:2022-2023学年八年级下学期期中考前必刷卷
更新时间:2022-09-22 17:22:37
|
相似题推荐
解答题-证明题
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【推荐2】今年中考结束后,我与同学们交流了宁波中考数学卷的压轴题,最后我们一致认为,这道题用了一个简单而重要的数学模型“三垂直型”,其实这种“模型”大家并不陌生.
如图1,
且
,由点
和点
向过
点的直线作垂线,可以构成如图两个全等三角形;当这条直线绕点
旋转到直角内部时,仍然能构造出全等三角形!相信同学们认识了这个“模型”的特点后,一定能解决下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/16562ca2-3de0-4023-a799-cbcefba38e35.png?resizew=445)
(1)如图3,
,
,若
,
,
(可以借助图中的辅助线,也可以根据自己所悟,另外画辅助线),你得到阴影部分的面积是: .
(2)如图4,点
是
的平分线任一点,连接
,作
交另一边
于点
,若
长是
,
,则四边形
的面积值是: .
(3)如图5,点
是两个等腰直角三角形的公共顶点,连接
和
,若
交
于
点,延长
交
于
点,试证明
.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dcca60ba6144abbf47abd51d1f63f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/16562ca2-3de0-4023-a799-cbcefba38e35.png?resizew=445)
(1)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244966fa5d60257327e78d621292fc7a.png)
(2)如图4,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3757794aa3436f7774257a8d72fabe4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
(3)如图5,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaf896af5f5a09da3e50a7964d26ba1.png)
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解答题-问答题
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名校
【推荐1】已知长方形
,
,
,
为
中点,点
从点
出发,沿着
,
边运动到点
停止,点
的速度为
,运动时间为
.
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571332010614784/2572098051612672/STEM/dba270ff-2fc5-4a18-a8be-ac266801eee6.png)
(1)当点
在
边上运动时,
________(用字母
表示);当点
在
边上运动时,
________(用字母
表示);
(2)当
的面积为
时,则
________;
(3)当
为等腰三角形时,则
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571332010614784/2572098051612672/STEM/dba270ff-2fc5-4a18-a8be-ac266801eee6.png)
(1)当点
![](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/524f25e1eedbfe399f7f42db890ab89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786cd645516dde315a4edb05229446fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16391623f297f18753bb51d8314c616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
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【推荐2】已知
和
都是等腰三角形,且
,
,若点D在
边上运动时,总保持
,连接
与
交于点F.
边中点时,则
的值为________;
②如图2,当点D不为
边中点时,求证:
;
(2)如图3,当点D在
边上运动中恰好使得
时,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102e836344156ea835d7d4e9b4120fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c3efba01fa23548d877edff59b64af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7088ab6302969d48ec277dbc51fd985.png)
②如图2,当点D不为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
(2)如图3,当点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐1】刘老师在“矩形的折叠”活动课上引导学生对矩形纸片进行折叠.
如图,将矩形纸片
折叠,点
与点
重合,点
与点
重合,将纸片展开,折痕为
,在
边上找一点
,沿
将
折叠,得到
,点
的对应点为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/431334f2-c034-4486-9bed-5deffe68530a.png?resizew=125)
(1)问题提出:若点
落在
上,
,连接
.
①
是______三角形;
②若
是等边三角形,则
的长为______.
(2)深入探究:在(1)的条件下,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
时,判断
的形状并证明;
(3)拓展延伸:若
,
,其他条件不变,当点
落在矩形
内部
包括边
时,连接
,直接写出
的取值范围.
如图,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/431334f2-c034-4486-9bed-5deffe68530a.png?resizew=125)
(1)问题提出:若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)深入探究:在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
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解答题-作图题
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较难
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【推荐2】综合与实践.
问题情境:
如图①,在纸片
中,
,
,过点
作
,垂足为点
,沿
剪下
,将它平移至
的位置,拼成四边形
.
独立思考:(1)试探究四边形
的形状.
深入探究:(2)如图②,在(1)中的四边形纸片
中,在
.上取一点
,使
,剪下
,将它平移至
的位置,拼成四边形
,试探究四边形
的形状;
拓展延伸:(3)在(2)的条件下,求出四边形
的两条对角线长;
(4)若四边形
为正方形,请仿照上述操作,进行一次平移,在图③中画出图形,标明字母,你能发现什么结论,直接写出你的结论.
问题情境:
如图①,在纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54efc4116b6cb296d55892a21e0d797f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7799d3bd5ebeeaf81f85f47cee8101f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23783499950900ccb32a1fb906f589cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fa4c6ca188ee77336376b749126b17.png)
独立思考:(1)试探究四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fa4c6ca188ee77336376b749126b17.png)
深入探究:(2)如图②,在(1)中的四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fa4c6ca188ee77336376b749126b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58230b030ddac1bffe759f3e37b74f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259baad031b059b1d075e99373dbaec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259baad031b059b1d075e99373dbaec2.png)
拓展延伸:(3)在(2)的条件下,求出四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259baad031b059b1d075e99373dbaec2.png)
(4)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/9afdca9e-66fa-43d3-a5aa-16cc3b875a13.png?resizew=496)
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解题方法
【推荐3】(1)探究发现:下面是一道例题及解答过程,请补充完整:
如图①在等边△ABC内部,有一点P,若∠APB=150°,求证:AP2+BP2=CP2
证明:将△APC绕A点逆时针旋转60°,得到△AP’B,连接PP’,则△APP’为等边三角形
∴∠APP’=60° ,PA=PP’ ,PC=
∵∠APB=150°,∴∠BPP’=90°
∴P’P2+BP2= ,即PA2+PB2=PC2
(2)类比延伸:如图②在等腰△ABC中,∠BAC=90°,内部有一点P,若∠APB=135°,试判断线段PA,PB,PC之间的数量关系,并证明.
(3)联想拓展:如图③在△ABC中,∠BAC=120°,AB=AC,点P在直线AB上方,且∠APB=60°,满足(kPA)2+PB2=PC2(其中k>0),请直接写出k的值.
如图①在等边△ABC内部,有一点P,若∠APB=150°,求证:AP2+BP2=CP2
证明:将△APC绕A点逆时针旋转60°,得到△AP’B,连接PP’,则△APP’为等边三角形
∴∠APP’=60° ,PA=PP’ ,PC=
∵∠APB=150°,∴∠BPP’=90°
∴P’P2+BP2= ,即PA2+PB2=PC2
(2)类比延伸:如图②在等腰△ABC中,∠BAC=90°,内部有一点P,若∠APB=135°,试判断线段PA,PB,PC之间的数量关系,并证明.
(3)联想拓展:如图③在△ABC中,∠BAC=120°,AB=AC,点P在直线AB上方,且∠APB=60°,满足(kPA)2+PB2=PC2(其中k>0),请直接写出k的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/a411144f-1b8d-46f5-8a8c-7f64c46291dd.png?resizew=462)
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名校
解题方法
【推荐1】如图,直线l1:y=2x+4与x轴交于点A,与y轴交于点B,将直线l1关于坐标原点中心对称后得到直线l2,l2与x轴交于点C,与y轴交于点D.
(1)求直线l2的表达式;
(2)求证:四边形ABCD为菱形;
(3)除菱形ABCD外,是否在直线l1上还存在点P,在直线l2上还存在点Q,使得以点B、C、P、Q为顶点的四边形为菱形?若存在,求出符合条件的所有点P坐标,若不存在,说明理由.
(1)求直线l2的表达式;
(2)求证:四边形ABCD为菱形;
(3)除菱形ABCD外,是否在直线l1上还存在点P,在直线l2上还存在点Q,使得以点B、C、P、Q为顶点的四边形为菱形?若存在,求出符合条件的所有点P坐标,若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/e81fcc91-55a9-4b75-bc91-2da0722081cc.png?resizew=182)
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【推荐2】如图,平面直角坐标系中,四边形
为矩形,点
坐标分别为
,动点
分别从
同时出发,以每秒1个单位的速度运动,其中点
沿
向终点
运动,点
沿
向终点
运动过动点
作
,交
于
,连接
,设
、
运动时间为
秒,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd20d1d5fbcf4cc7196a79b4105c700.png)
(1)当
秒时,
点的坐标为(____,____),
__________;
(2)当
为何值时,以
为顶点的三角形与
相似;
(3)在平面内是否存在一个点
,使以
为顶点的四边形是菱形,若存在,请直接写出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e71e34d9a5bab6a902aa326ca44df71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc62c28c53286cd17e9eb997af7221.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23020e4658a0175a7b79d5bee358dd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd20d1d5fbcf4cc7196a79b4105c700.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/147b72c6-b2e7-470b-b166-e3fbbe2e5b3e.png?resizew=155)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7d551cca653e2d638c8cab4c2fda8.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594b542e9a73b2f6d38f0562546be602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在平面内是否存在一个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10759fa31fcf33867157409ef386dc6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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(0.4)
【推荐3】【问题情景】
在正方形
中,
,点
是边
上的一个动点,过点
作
交
于点
,将正方形
折叠,使点
的对应点
落在
上,点
的对应点为
,折痕所在的直线交边
于点
,交边
于点
,
与
交于点
,连接
,过点
作
于点
.
【猜想证明】
(1)如图①,当点
是
的中点,点
和点
重合时,试猜想:
与
的位置关系为______,数量关系为______.
(2)当点
和点
重合时,(1)中的结论是否仍然成立?若成立,请就图②所示的情形给出证明;若不成立,请写出正确结论并加以证明.
【问题解决】
(3)在(2)的条件下,若点
是
的三等分点,请直接写出
的长度.
在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259a6725a9231c13ee8775d84ea397ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee133796c211c17eae0aa38659123ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
【猜想证明】
(1)如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199336204fbca97766bf24b1dc5fdc53.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
【问题解决】
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae72f1da4f5d540dc1e6f42ea08f952e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/c5678302-22cf-4806-a19a-551a9cc8043e.png?resizew=393)
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