1 . 如图,在矩形ABCD中,AB=10,AD=6.以点A为中心,逆时针旋转矩形ABCD,得到矩形AEFG,点B,C,D的对应点分别为点E,F,G.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618709021523968/2623224355733504/STEM/3a518b98b96e45cb8a6050fa246534b3.png?resizew=321)
(1)如图1,当点E落在边CD上时,求线段CE的长;
(2)如图2,当点E落在线段CF上时,求证:∠EAC=∠BAC;
(3)在(2)的条件下,CD与AE交于点H,求线段DH的长.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618709021523968/2623224355733504/STEM/3a518b98b96e45cb8a6050fa246534b3.png?resizew=321)
(1)如图1,当点E落在边CD上时,求线段CE的长;
(2)如图2,当点E落在线段CF上时,求证:∠EAC=∠BAC;
(3)在(2)的条件下,CD与AE交于点H,求线段DH的长.
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2 . 如图,正方形 ABCD 中,点 E 是 CD 边上一点,连接 AE,过点 B 作 BG⊥AE 于点 G, 连接 CG 并延长交 AD 于点 F,当 AF 的最大值是 2 时,正方形 ABCD 的边长为______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/210d3b78-3e26-4677-b54d-b56be5c78245.png?resizew=131)
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2020-11-25更新
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3卷引用:湖北省十堰市房县2020-2021学年九年级上学期期中数学试题
3 . 如图,▱ABCD中,点E是BC的中点,连接AE并延长交DC延长线于点F.
(1)求证:CF=AB;
(2)连接BD、BF,当∠BCD=90°时,求证:BD=BF.
(1)求证:CF=AB;
(2)连接BD、BF,当∠BCD=90°时,求证:BD=BF.
![](https://img.xkw.com/dksih/QBM/2020/11/20/2596768154419200/2599885401030656/STEM/d0862373f8ca4e508a9168040c6a6c3b.png?resizew=167)
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2020-11-24更新
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3卷引用:2020年湖北省潜江市张金中学中考数学模拟试卷(6月份)
2020年湖北省潜江市张金中学中考数学模拟试卷(6月份)(已下线)专题12.2 矩形菱形和正方形(2)-备战2021年中考数学精选考点专项突破题集(全国通用)2023年浙江省丽水市庆元县江根乡中学中考一模数学试题
4 . 如图,在△ABC中,AB=6,AC=8,BC=10,P为边BC上一动点,PE⊥AB于E,PF⊥AC于F,M为EF中点,则AM的最小值为( )
![](https://img.xkw.com/dksih/QBM/2020/11/18/2595751199031296/2598983517716480/STEM/f105e1fb-7caf-4402-b77c-d358293b7289.png)
![](https://img.xkw.com/dksih/QBM/2020/11/18/2595751199031296/2598983517716480/STEM/f105e1fb-7caf-4402-b77c-d358293b7289.png)
A.2 | B.2.4 | C.2.6 | D.3 |
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2020-11-23更新
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345次组卷
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3卷引用:湖北省宜昌市第二十六中学2019-2020学年八年级上学期期末数学试题
5 . 如图,M为矩形ABCD中AD边中点,E、F分别为BC、CD上的动点,且BE=2DF,若AB=1,BC=2,则ME+2AF的最小值为 ________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/9271a7ad-8532-4013-9799-1388206a43c6.png?resizew=152)
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6 . 如图,以矩形ABCD对角线BD上一点O为圆心作⊙O过A点并与CD切于E点,若CD=3,BC=5,则⊙O的半径为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8db76ed1-2490-4710-ba90-f5c8528746ef.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8db76ed1-2490-4710-ba90-f5c8528746ef.png?resizew=211)
A.![]() | B.3 | C.![]() | D.![]() |
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7 . 我们定义:如图1,在△ABC中,把AB点绕点A顺时针旋转
得到
.把AC绕点A逆时针旋转
得到
,连接
.当
=180°时,我们称△
是△ABC的“旋补三角形”,△A
边
上的中线AD叫做△ABC的“旋补中线”,点A叫做“旋补中心”.
特例感知:
(1) 在图2,图3中,△A
是△ABC的“旋补三角形”,AD是△ABC的“旋补中线”
① 如图2,当△ABC为等边三角形时,AD与BC的数量关系为AD= BC.
②如图3.当∠BAC=90°,BC=8时,则AD长为
[猜想论证]
(2) 在图1中,当△ABC为任意三角形时,猜想AD与BC的数量关系,并给予证明.
[拓展应用]
(3) 如图4,在四边形ABCD内部恰好存在一点P,使△PDC是△PAB的“能补三角形”,自行补图形,∠C=90°,∠D=150°,BC=12,CD=
,AB=2
.直接写出△PAB的“旋补中线”长是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36471e4e7749cd8da4bc9b4b3dc85fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ac8c5700ce2de9a140c4adea742168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecbed9cb44cd1f0bad05d3db2ffff18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f3cbee923ebf5179770f7dbb53b38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d59152f6b55e50dffbc6e9cda21fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f3cbee923ebf5179770f7dbb53b38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f3cbee923ebf5179770f7dbb53b38f.png)
特例感知:
(1) 在图2,图3中,△A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f3cbee923ebf5179770f7dbb53b38f.png)
① 如图2,当△ABC为等边三角形时,AD与BC的数量关系为AD= BC.
②如图3.当∠BAC=90°,BC=8时,则AD长为
[猜想论证]
(2) 在图1中,当△ABC为任意三角形时,猜想AD与BC的数量关系,并给予证明.
[拓展应用]
(3) 如图4,在四边形ABCD内部恰好存在一点P,使△PDC是△PAB的“能补三角形”,自行补图形,∠C=90°,∠D=150°,BC=12,CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/985f75c624e091eca4809b1dd94f0530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766dfef2a4159f49c7bd349fb36d670.png)
![](https://img.xkw.com/dksih/QBM/2020/10/26/2579559719550976/2580738071461888/STEM/a89e26e3602241828651e14976d57b55.png?resizew=479)
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8 . 如图,四边形ABCD中,∠ABC=90°,AC=BD,AC⊥BD,若AB=4,AD=5,则DC的长( )
![](https://img.xkw.com/dksih/QBM/2020/9/30/2560655780544512/2565351034806272/STEM/eacda53649c44e4294f5288147f97ade.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2020/9/30/2560655780544512/2565351034806272/STEM/eacda53649c44e4294f5288147f97ade.png?resizew=135)
A.7 | B.![]() | C.![]() | D.![]() |
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9 . 如图,在矩形
中
是
的中点,
是
的中点,点
在
上.分别连接
交于点
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0acaca7ce64a0f698cd854915fffc06.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/917641f2c538951ed5b2346e500b5e0b.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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de32260ba2cb998f3ffb8449cdaf7708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9700dab11dc96155f348374140af9aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0acaca7ce64a0f698cd854915fffc06.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007216640/STEM/80e13039-e690-40a0-b1c2-cd37e41b9cac.png)
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10 . 如图,在直角坐标系中,
为
,
两点分别在
轴、
轴上,
点坐标为
,将
沿
翻折,
点落在
点位置,
交
轴于点E,求
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72d27854b0f5a2fa22ba719ac66071a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25902a209929515dc03560bdaaeb24e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ce2f5e22175e3ff8ab5e0afca58f9c.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/10/2/2562514037628928/2563559855349760/STEM/7ea5ac55-3242-4453-b6b0-a7fe4f45594f.png?resizew=129)
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2020-10-04更新
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182次组卷
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2卷引用:湖北省黄冈市蕲春县2019-2020学年八年级下学期期中数学试题