如图,把一块含
直角三角板的锐角顶点与正方形
的顶点A重合.正方形
固定不动,让三角板绕点A旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/e9a683b7-d5aa-4983-8724-fbc639f56ceb.png?resizew=300)
(1)当三角板绕点A旋转到如图①的位置时,含
角的两边分别与正方形的边
、
交于点
、
,求证:
;
(2)当三角板绕点A旋转到如图②的位置时,含
角的两边分别与正方形的边
、
的延长线交于点E、F.试写出
、
和
三条线段满足的数量关系,不必证明;
(3)在图①中,当正方形
的边长为6,
,
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/e9a683b7-d5aa-4983-8724-fbc639f56ceb.png?resizew=300)
(1)当三角板绕点A旋转到如图①的位置时,含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.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/7c9af98a1a048b1e2f7c71e83c33498c.png)
(2)当三角板绕点A旋转到如图②的位置时,含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)在图①中,当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7c422a19b68b8b4cd484d22897e3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
更新时间:2016-12-06 04:00:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】(1)问题发现
如图1,在
中,
,D是线段
上一动点,以
为一条边在
A的左侧作
,使
,连接
.则
与
的数量关系为_________.
(2)类比探究
如图2,在
中,D是线段
上一动点,以
为一条边在
的左侧作
,使
且
,连接
.则(1)中
与
的数量关系仍然成立吗?请说明理由.
(3)拓展应用
如图3,在(2)的条件下,若
,
,当
取最小值时,
的面积为_________.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dd17e73fc1db1a8155eb91c8c4e8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)类比探究
如图2,在
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da756f78b3409948a841ecb549f64bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316908a938af254508f414226ba328cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(3)拓展应用
如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/9f77a530-d386-4b94-aa10-afcd97afba6e.png?resizew=389)
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【推荐2】如图,在△ABC中,∠BAC=90°,AB=AC,点D是BC上一动点,连接AD,过点A作AE⊥AD,并且始终保持AE=AD,连接CE.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848299384455168/2849759701237760/STEM/58ba476bfbb44989a79d204c8dcdc53d.png?resizew=275)
(1)求证:△ABD≌△ACE;
(2)若AF平分∠DAE交BC于F,若BD=3,CF=4,求DF的长.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848299384455168/2849759701237760/STEM/58ba476bfbb44989a79d204c8dcdc53d.png?resizew=275)
(1)求证:△ABD≌△ACE;
(2)若AF平分∠DAE交BC于F,若BD=3,CF=4,求DF的长.
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解答题-问答题
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适中
(0.65)
【推荐1】已知正方形
和正方形
按图1所示叠放在一起,其中
,
,点O为
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/25f76464-559a-43d1-b83a-896bbabda9e2.png?resizew=383)
(1)图2中正方形
为图1中正方形
关于直线
的轴对称图形,求点D和点U的连结线段
的长度;
(2)将图1中的正方形
绕点O旋转,如图3所示,求运动过程中点D和点G之间距离的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/25f76464-559a-43d1-b83a-896bbabda9e2.png?resizew=383)
(1)图2中正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb45ad1dde9b4c5e21253f50ec6ad29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3269338eff48c47289b2bc2e0a15ad68.png)
(2)将图1中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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【推荐2】如图,在
中,
,点D在
边上(不与A,C重合),连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/b279ebea-5c58-47b6-89ea-cd1ee4151748.png?resizew=209)
(1)设
,
.
①当
时,求
.
②请求出
与
的数量关系.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a1d4c140243ba9a9bd7256ec2bbce6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/b279ebea-5c58-47b6-89ea-cd1ee4151748.png?resizew=209)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148cdaa1d55e9a3d940a4af77610cade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f62d6dc1a687fe06224326f3dde339c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af2577e349157f70effa2a074c9c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)若
![](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/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图1,边长为
的正方形
中,点P为
上一个动点,连接
,作
于点
,交边
于点M,
于
.
;
(2)如图2,连接
,线段
交
于点
,点
为
的中点.
时,求
的长;
②线段
是否存在最小值和最大值,若存在,请直接写出线段
的最小值和最大值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcabbb4a3204d94675ce39838e13c3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9172c05a868ee87e293e6dee6094834f.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d10f2db7289ff1ec65c47d9af77a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
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【推荐2】如图,已知正方形ABCD,点E在边BC上,连接AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/f29cf9ee-1b83-4f58-bb9a-95800d041203.png?resizew=188)
(1)尺规作图:作∠ADF,使∠ADF=∠BAE,点F是∠ADF的边与线段AB的交点(不写作法,不写结论,保留作图痕迹);
(2)求证:AE=DF且AE⊥DF.
证明:设AE交DF于点T.
在正方形ABCD中,DA=AB,
∠DAF=∠B=90°,
又∵
∴△DAF≌△
∴ , .
∵∠BAE+∠DAT=90°,∴∠ADF+∠DAT=90°.∴∠ATD=90°.
∴AE⊥DF,∴AE=DF,AE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/f29cf9ee-1b83-4f58-bb9a-95800d041203.png?resizew=188)
(1)尺规作图:作∠ADF,使∠ADF=∠BAE,点F是∠ADF的边与线段AB的交点(不写作法,不写结论,保留作图痕迹);
(2)求证:AE=DF且AE⊥DF.
证明:设AE交DF于点T.
在正方形ABCD中,DA=AB,
∠DAF=∠B=90°,
又∵
∴△DAF≌△
∴ , .
∵∠BAE+∠DAT=90°,∴∠ADF+∠DAT=90°.∴∠ATD=90°.
∴AE⊥DF,∴AE=DF,AE⊥DF.
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【推荐3】定义:有一个内角为90°,且对角线相等的四边形称为准矩形.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574238667030528/1574238673485824/STEM/cae1e2fc-42bc-461c-b683-bfbcd86c357c.png?resizew=477)
(1)①如图1,准矩形ABCD中,∠ABC=90°,若AB=2,BC=3,则BD= ;
②如图2,直角坐标系中,A(0,3),B(5,0),若整点P使得四边形AOBP是准矩形,则点P的坐标是 ;(整点指横坐标、纵坐标都为整数的点)
(2)如图3,正方形ABCD中,点E、F分别是边AD、AB上的点,且CF⊥BE,求证:四边形BCEF是准矩形;
(3)已知,准矩形ABCD中,∠ABC=90°,∠BAC=60°,AB=2,当△ADC为等腰三角形时,请直接写出这个准矩形的面积是 .
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574238667030528/1574238673485824/STEM/cae1e2fc-42bc-461c-b683-bfbcd86c357c.png?resizew=477)
(1)①如图1,准矩形ABCD中,∠ABC=90°,若AB=2,BC=3,则BD= ;
②如图2,直角坐标系中,A(0,3),B(5,0),若整点P使得四边形AOBP是准矩形,则点P的坐标是 ;(整点指横坐标、纵坐标都为整数的点)
(2)如图3,正方形ABCD中,点E、F分别是边AD、AB上的点,且CF⊥BE,求证:四边形BCEF是准矩形;
(3)已知,准矩形ABCD中,∠ABC=90°,∠BAC=60°,AB=2,当△ADC为等腰三角形时,请直接写出这个准矩形的面积是 .
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