名校
1 . 阅读下面活动内容,完成探究1-3的问题:将一个矩形
绕点A顺时针旋转α
,得到矩形
,连结
.
[探究1]如图1,当
时,点
恰好在
延长线上.若
,求
的长.
[探究2]如图2,连结
,过点
作
交
于点M,线段
与
相等吗?请说明理由.
[探究3]在探究2的条件下,射线
分别交
,
于点P,N(如图3),发现线段
存在一定的数量关系,请写出这个关系式,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d373bc225f461dc681e1623a40fe98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f669bdadebe4849e29e9bd3b2efe2ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/3fc7958b-3453-44c1-aaf5-133cdea9853f.png?resizew=575)
[探究1]如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
[探究2]如图2,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c962456e190ea0d7e6e88782aa8c161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4171e7f713d6b265d56b2662b7af57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc72b34573c6bca05b73e81c34f44d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab71234837e6b78b80519c696662a198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
[探究3]在探究2的条件下,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bb0944a7fd72c026500ac8e8d4d1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c962456e190ea0d7e6e88782aa8c161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef5f0258a1c609e2cbb312a74bcc8ad.png)
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2023-05-30更新
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6卷引用:2023年安徽省安庆市第二中学中考二模数学试题
2 . 在数学探究活动中,小明进行了如下操作:如图,在三角形纸片
(
)中剪下以C点为一个顶点,另3个顶点分别在
、
、
上的一个正方形
,量得
,
.
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188464246161408/3189407782502400/STEM/505d7db01d03410f99eb87da363e20d0.png?resizew=88)
(1)正方形
的面积为_____ .
(2)设
和
的面积分别为
的值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1777acc5d9f9195b2d1b474a504766f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782880ee8b61f64b5e6c31d275039ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3998154270e20bf3f739cb4bcdac16e2.png)
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188464246161408/3189407782502400/STEM/505d7db01d03410f99eb87da363e20d0.png?resizew=88)
(1)正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d827d6df98b0fb416169bf4a62e8b1.png)
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3 . 某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
![](https://img.xkw.com/dksih/QBM/2022/5/4/2978620094267392/2980620169560064/STEM/68a73e1b-02f2-4cee-b3cc-5d7bf64ac332.png?resizew=540)
(1)如图1,在正方形ABCD中,E,F分别是AB,AD上的两点,连接DE,CF,若DE⊥CF,求证:CF=DE.
(2)如图2,在矩形ABCD中,过点C作CE⊥BD交AD于点E,若
,求
的值.
(3)如图3,在四边形ABCD中,∠A=∠B=90°,E为AB上一点,连接DE,过点C作DE的垂线交ED的延长线于点G,交AD的延长线于点F,且AB=5,AD=3,CF=7.求DE的长.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2978620094267392/2980620169560064/STEM/68a73e1b-02f2-4cee-b3cc-5d7bf64ac332.png?resizew=540)
(1)如图1,在正方形ABCD中,E,F分别是AB,AD上的两点,连接DE,CF,若DE⊥CF,求证:CF=DE.
(2)如图2,在矩形ABCD中,过点C作CE⊥BD交AD于点E,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968f5fd009e1d4c430529e24f8c92b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
(3)如图3,在四边形ABCD中,∠A=∠B=90°,E为AB上一点,连接DE,过点C作DE的垂线交ED的延长线于点G,交AD的延长线于点F,且AB=5,AD=3,CF=7.求DE的长.
您最近一年使用:0次
2022-05-16更新
|
398次组卷
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6卷引用:2022年安徽省宣城市宣州区九年级中考第二次模拟考试数学试题
2022年安徽省宣城市宣州区九年级中考第二次模拟考试数学试题(已下线)专题08 图形的变换-5年(2018-2022)中考1年模拟数学分项汇编(安徽专用)2023年安徽省池州市贵池区等两地部分学校联考中考二模数学试题(已下线)专题14 四边形综合题(针对20、22、23题) -学易金卷:五年(2019-2023)中考1年模拟数学真题分项汇编(安徽专用)(已下线)2023年安徽二模几何综合32022年安徽省宣州区九年级第二次模拟考试数学试题
2022·安徽合肥·二模
解题方法
4 . 如图1,为了探究某种类型矩形ABCD的性质,数学项目学习小组在BC边上取一点E,连接DE.经探究发现:当DE平分∠ADC时,将△ABE沿AE折叠至△AFE,点F恰好落在DE上.据此解决下列问题:
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978753381302272/2979805287096320/STEM/11fefa77-01ee-40e8-a244-44a84ae1e144.png?resizew=377)
(1)求证:△AFD≌△DCE;
(2)如图2,延长CF交AE于点G,交AB于点H.
①求证:AH·AF=AG·CF ;
②求GH∶DF的值.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978753381302272/2979805287096320/STEM/11fefa77-01ee-40e8-a244-44a84ae1e144.png?resizew=377)
(1)求证:△AFD≌△DCE;
(2)如图2,延长CF交AE于点G,交AB于点H.
①求证:AH·AF=AG·CF ;
②求GH∶DF的值.
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2022九年级上·浙江·专题练习
5 . 在数学探究活动中,小明进行了如下操作:如图,将两张等腰直角三角形纸片
和
如图放置(其中
,
,
.
、
分别与
边相交于
、
两点.请完成下列探究:
(1)若
,则
的值为__ ;
(2)过
作
于
,若
,则
的值为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314b5f0d19f019dbaaaf39f03bbd3340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c6cc9aa7a9221e8cd02440e7a9fe05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f56c4bde8243588046f208c2e06f74c.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181dcfb5e97b5f0a9347278c5afd2149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3949b38fd567d1f9441a9bb36eb93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15fee7af78b5bcbaffa28143a4e41f9.png)
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6 . 如图,在矩形ABCD中,AD=3,AB=4,E是边AB上一点,△BCE与△FCE关于直线CE对称,连接BF并延长交AD于点G,过点F作FH⊥AD,垂足为点H,设BE=a,请完成下列探究:
(1)AG=_______ (用含a的代数式表示);
(2)若点H为AG的中点,则BE的长为_______ .
(1)AG=
(2)若点H为AG的中点,则BE的长为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/3fe849c4-45d1-40a1-a193-ee02d10ac25b.png?resizew=153)
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2022-07-10更新
|
170次组卷
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2卷引用:2021年安徽省九年级初中学业水平考试模拟数学试题
7 . 四边形ABCD是一张矩形纸片,点E在AD上,将△ABE沿BE折叠,使点A落在矩形的对角线BD上,连接CF,若DE=1,请探究下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/2386fc64-283d-4621-9f86-e84e5ab78f31.png?resizew=263)
(1)如图1,当F恰好为BD的中点时,AE= ;
(2)如图2,当点C、E、F在同一条直线上时,AE= .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/2386fc64-283d-4621-9f86-e84e5ab78f31.png?resizew=263)
(1)如图1,当F恰好为BD的中点时,AE= ;
(2)如图2,当点C、E、F在同一条直线上时,AE= .
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2022-03-17更新
|
174次组卷
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2卷引用:安徽省合肥市高新区2021-2022学年九年级上学期期末数学试题
名校
8 . 如图,抛物线
交x轴于点
、
,与y轴交于C点,直线
交线段BC下方抛物线于D点,交BC于E点
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983634376024064/2985540891009024/STEM/a3dec1db-94ad-4ecf-8eb5-e5bf27d4a116.png?resizew=315)
(1)分别求出a、b的值
(2)求出线段BC的函数关系式,并写出自变量取值范围
(3)探究
是否有最大值,若存在,请求出此时k值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2761aa85c2256bb59665e1d3242dcde.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983634376024064/2985540891009024/STEM/a3dec1db-94ad-4ecf-8eb5-e5bf27d4a116.png?resizew=315)
(1)分别求出a、b的值
(2)求出线段BC的函数关系式,并写出自变量取值范围
(3)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2667906e4c8d031d2f86404ce10c78.png)
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9 . 如图,在矩形ABCD中,AD=3,AB=4,E是边AB上一点,△BCE与△FCE关于直线CE对称,连接BF并延长交AD于点G,请完成下列探究:
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991492707655680/2992093370220544/STEM/da3b4e71-26e3-42c8-80e7-b6ed94ab6a74.png?resizew=138)
(1)设BE=a,则AG=_________ (用含a的代数式表示 );
(2)若点F为BG中点,则BE的长为___________ ;
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991492707655680/2992093370220544/STEM/da3b4e71-26e3-42c8-80e7-b6ed94ab6a74.png?resizew=138)
(1)设BE=a,则AG=
(2)若点F为BG中点,则BE的长为
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10 . 如图,在正方形ABCD中,点F是边DC上一个动点,连接BF,在其上取一点E,使得AE=AD,AE与BD交于点G.解答下面问题:
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951116045828096/2951458307506176/STEM/140c1dea2d3a4ce7bf827b7cd0acc0fe.png?resizew=507)
(1)如图(1),探究
大小是否为定值,如果是,则求出;如果不是,则说出理由;
(2)如图(2),若正方形的边长为2,当
时,求DF长;
(3)如图(3),连接EC,若
,求证:
.
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951116045828096/2951458307506176/STEM/140c1dea2d3a4ce7bf827b7cd0acc0fe.png?resizew=507)
(1)如图(1),探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
(2)如图(2),若正方形的边长为2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347d67803cf8ea9573f55b713934aae4.png)
(3)如图(3),连接EC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b779c20c8b55df1ae9d44f1c80785ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5da44bd1537984418603aca93fc2e1.png)
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2022-04-05更新
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301次组卷
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3卷引用:安徽省黄山市黄山区2021届中考二模数学试题