1 . 某数学学习小组学习完四边形后进行了如下探究,已知四边形
为矩形,请你帮助他们解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
的顶点
、
分别在如图(1)所示的
的边
、
上,顶点
、
恰好落在
的对角线
上,求证:
;
(2)【深入探究】:如图2,若
为菱形,
,若
,求
的值;
(3)【拓展延伸】:如图(3),若
为矩形,
;
且
,请直接写出此时
的值是________(用含有
,
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f90a3773e6944013a0eb41279f332f.png)
(2)【深入探究】:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e9fe9bcc967fb43ea66ab995f7c1c9.png)
(3)【拓展延伸】:如图(3),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3be96420ac78c8621fcb47a45514fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7be5da220f32cb7c8aad9ca5ced32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01943be6d886ec97fc1c18e73b0d4ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2024-01-18更新
|
155次组卷
|
3卷引用:广东省深圳市南山区中科先进实验学校2023-2024学年九年级上学期期末数学试题
2 . 模型探究:(1)如图1,在四边形
中,
,
,
于点E,若
,求四边形
的面积.
拓展应用:(2)如图2,在四边形ABCD中,
,
,
于点E,若
,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展应用:(2)如图2,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555bfe8dfaaf36f3b784c53c61f3e775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8003814834287e122a12b64a936dba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/967e1ec0-4499-4c32-8979-2ec4f4ed180c.png?resizew=245)
您最近一年使用:0次
名校
3 . 【问题背景】为了保持室内空气的清新,某仓库的门动换气窗采用了以下设计:
如图1,窗子的形状是一个五边形,它可看作是由一个矩形
和一个
组成,该窗子关闭时可以完全密封,根据室内的温度和湿度也可以自动打开窗子上的通风口换气.通风口为
(阴影部分均不通风),点F为
的中点,
是可以沿窗户边框上下滑动且始终保持和
平行的伸缩横杆.
、
分别为am,bm,窗子的高度(窗子的最高点到边框
的距离)为cm.
【初步探究】
(1)若
(即点E到
的距离为4).
①
与
之间的距离为1m,求此时
的面积;
②
与
之间的距离为xm,试将通风口的面积
表示成关于x的函数;
③伸缩杆
移动到什么位置时,通风口面积最大,最大面积是多少?
【拓展提升】
(2)若金属杆
移动到高于
所在位置的某一处时通风口面积达到最大值.
①c需要满足的条件是 ,通风口的最大面积是
(用含a、b、c的代数式表示)
②用直尺和圆规在图3中作出通风口面积最大金属杆
所在的位置,(保留作图痕迹,不写作法)
如图1,窗子的形状是一个五边形,它可看作是由一个矩形
![](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/ecfb02e157819a2bdd0f2790cbc825e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【初步探究】
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6274340f4becbc40f2cb54099293df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfb02e157819a2bdd0f2790cbc825e9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
③伸缩杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【拓展提升】
(2)若金属杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①c需要满足的条件是 ,通风口的最大面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
②用直尺和圆规在图3中作出通风口面积最大金属杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2023-03-13更新
|
461次组卷
|
4卷引用:2023年江苏省盐城市盐都区义丰初级中学下学期九年级数学第一次模拟试题
名校
4 . [教材呈现]下面是华师版八年级下册数学教材第104页的部分内容.
如图,
、
是
的两条直径,四边形
是矩形吗?证明你的结论.
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188631496925184/3190862349164544/STEM/aa1a22cacdaa4af39a9dae7aea122050.png?resizew=466)
(1)[问题解决]如图①,
、
是
的两条直径.求证:四边形
是矩形.
[发现结论]矩形的四个顶点都在以该矩形对角线的交点为圆心,对角线的长为直径的圆上.
(2)[结论应用]如图②,已知线段
,以线段
为对角线构成矩形
,矩形
面积的最大值为 .
(3)[拓展延伸]如图③,在矩形
中,
,
,点
、
分别为边
、
的中点,以线段
为对角线构造矩形
,矩形
的边与矩形
的对角线
交于
、
两点,当
的长最长时,矩形
的面积为 .
如图,
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188631496925184/3190862349164544/STEM/aa1a22cacdaa4af39a9dae7aea122050.png?resizew=466)
(1)[问题解决]如图①,
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
[发现结论]矩形的四个顶点都在以该矩形对角线的交点为圆心,对角线的长为直径的圆上.
(2)[结论应用]如图②,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
(3)[拓展延伸]如图③,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
您最近一年使用:0次
5 . 问题提出
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/2e1e1b18-a5e0-4f23-b455-bb7cf950654a.png?resizew=436)
如图
,在
中,
.若
,则
的值为__________.
问题探究
如图
,在四边形
中,对角线
、
相交于点
,
、
、
、
分别为
、
、
、
的中点,连接
、
、
、
.若
,求四边形
的面积.
问题解决
如图
,某市有一块五边形空地
,其中
米,
米,
米,
米,现计划在五边形空地内部修建一个四边形花园
,使点
、
、
、
分别在边
、
、
、
上,要求
请问,是否存在符合设计要求的面积最大的四边形花园
?若存在,求四边形
面积的最大值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/2e1e1b18-a5e0-4f23-b455-bb7cf950654a.png?resizew=436)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4d24c1c0d75be03afbfe64a41aee7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
问题探究
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0989ab6363e37ecee4565ded7891fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87a0802a3da63fbf219b527636864cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
问题解决
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6723f8b9d907981aa735cd96386bee36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eeec9cb156d9fbb9ac1bf3f9a675260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb19963d0798aabcb1b4b8b951bc302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd81878e3c1a10e9cc9f056f09b2eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78245a4a4d968e5f8b78606505d8733d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84cf2eac4f5d07bb7e68795462bd3732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e420f0021f02177e7818224e7b90c2cf.png)
您最近一年使用:0次
6 . 【问题探究】
(1)如图1,已知
,点D是
的中点,连接
,则
(填“
”“
”或“
”)
(2)如图2,在梯形
中,
,请过点A作一条直线
平分梯形
的面积,点P是
与
的交点,并说明理由;
【问题解决】
(3)如图3是某公园的一块空地,由
和四边形
组成,
,
,
米,
,
,公园管理人员现准备过点A修一条笔直的小路
(小路面积忽略不计),将这块空地分成面积相等的两部分(点M在
边上),分别种植两种不同的花卉,请在图中确定点M的位置,并计算小路
的长.(结果保留根号)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4673ef63a8d89687b96ee09887ac3daa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c141b06b158e0cdef08fcda3ea44a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)如图2,在梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
【问题解决】
(3)如图3是某公园的一块空地,由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa485cf3776f36aaf4abaadaf30fb85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077956e5f55232814d1a077af264590e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b1879d919064e3839b8aea8d3459b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41f2f95d643629321deb6e905c4f1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a868322c7ec1b016a23df3ea18183080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d61f0d746987c2f76f5e061f71fc45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25120e4c19a21da5596451798c255902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/cf4b2284-4668-4b14-a781-d5fb8b49e7e8.png?resizew=465)
您最近一年使用:0次
7 . 探究与发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/93d06bc9-4639-42ab-b28e-c0a4e8b792c9.png?resizew=359)
(1)如图①,四个小长方形拼成一个大长方形,点
在线段
上,试判断长方形
与长方形
面积的大小关系,并简单说明理由;
(2)如图②,长方形
的顶点
在直角三角形
的斜边
上,若
,
,利用第(1)小题的探究方法和结论 ,求长方形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/93d06bc9-4639-42ab-b28e-c0a4e8b792c9.png?resizew=359)
(1)如图①,四个小长方形拼成一个大长方形,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3ae5f3c1a40be9a6c415409382aa57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1e5ffab8df4dbe139ffedf691b2346.png)
(2)如图②,长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1e5ffab8df4dbe139ffedf691b2346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc219440fcf760bd7a78c4d5c650cccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b7db64f7c4cfdb87b69b01099d3e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1e5ffab8df4dbe139ffedf691b2346.png)
您最近一年使用:0次
2024-01-19更新
|
124次组卷
|
2卷引用:江苏省苏州市2023-2024学年七年级上学期期中数学试题
8 . 定义:有一个角是直角的平行四边形叫做矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/4cf8e596-ee07-4b24-bcb8-f55fecd522b9.png?resizew=576)
(1)根据定义判矩形
已知:如图1,在平行四边形
中,
是它的两条对角线,
.求证:平行四边形
是矩形.
(2)动手操作有发现
如图2,在矩形
中,
是
的中点,将
沿
折叠后得到
,点
在矩形
内部,延长
交
于点
.猜想线段
与
有何数量关系?并证明你的结论.
(3)类比探究到一般
如图3,将(2)中的矩形
改为平行四边形,其它条件不变,(2)中的结论是否仍然成立,请说明理由.
(4)解决问题巧应用
如图4,保持(2)中的条件不变,若
点是
的中点,且
,请直接写出矩形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/4cf8e596-ee07-4b24-bcb8-f55fecd522b9.png?resizew=576)
(1)根据定义判矩形
已知:如图1,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)动手操作有发现
如图2,在矩形
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.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/6aa2b5e09f8ec785c59900a529390a02.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/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
(3)类比探究到一般
如图3,将(2)中的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(4)解决问题巧应用
如图4,保持(2)中的条件不变,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2023-03-20更新
|
311次组卷
|
2卷引用:山东省淄博市张店区淄博市张店区世纪中学等2校2022-2023学年八年级上学期期末数学试题
名校
9 . 【探究与应用】
我们把平行四边形沿着它的一条对角线翻折,会发现有很多结论.例如:在平行四边形
中,
,将
沿直线
翻折至
,连接
,则
.
与
相交于点O,证明以上这个结论;
小明同学提出如下解题思路,请补全:
【思路分析】
由折叠的性质得
,
;由平行四边形的性质得______,
.由上面的分析可证得
,______,这样就可以得到
,则______,再由等腰三角形的性质得
,证出
,即可得出结论;
(2)如图2,
与
相交于点O,若
,
,
,则
的面积为______;
(3)如果
,
,
①当
是直角三角形时,请画图并直接写出
的长.
②设
的长度为x,当
时,直接写出 x的取值范围.
我们把平行四边形沿着它的一条对角线翻折,会发现有很多结论.例如:在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a320a6a242be91347d1b241f6313251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1e679d83e4675cdef9b81a62c53f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
小明同学提出如下解题思路,请补全:
【思路分析】
由折叠的性质得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082811d4f5d199b0b5a5fd259e267a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915b7d1abc441d76c7485628219d71f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46310f3431c0a78842751c83f89753d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dedee58b1338be6e2f552829b5b9f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15941430a549cbc8563e8b50d53e58c7.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2bb3e92634857d82126748c70443a1.png)
您最近一年使用:0次
10 . 如图,在▱ABCD中,对角线AC、BD交于点O,E、F分别是BO、DO的中点,G、H分别是AD、BC的中点,顺次连接G、E、H、F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/7765541e-d447-4b7e-a74b-34771170808a.png?resizew=179)
(1)求证:四边形GEHF是平行四边形;
(2)若BD=2AB.
①探究四边形GEHF的形状,并说明理由;
②当AB=2,
时,求四边形GEHF的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/7765541e-d447-4b7e-a74b-34771170808a.png?resizew=179)
(1)求证:四边形GEHF是平行四边形;
(2)若BD=2AB.
①探究四边形GEHF的形状,并说明理由;
②当AB=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
您最近一年使用:0次
2022-09-06更新
|
315次组卷
|
5卷引用:专题18.26 矩形(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)
(已下线)专题18.26 矩形(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题18.28 矩形(巩固篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题5.3 矩形(巩固篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题5.1 矩形(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)浙江省金华市义乌市宾王中学2021-2022学年八年级下学期期中数学试题