如图,在
中,已知
,
,
,点
在边
上,
,线段
绕点
顺时针旋转
度后(
),点
旋转至点
,如果点
恰好落在
的边上,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d301e9e1129c433e7ed1bf66c573675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
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![](https://img.xkw.com/dksih/QBM/2019/8/23/2275004222783488/2275233889083392/STEM/49ef090edc8349269bbfe7bed35db4f0.png?resizew=150)
更新时间:2019-08-23 23:18:06
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名校
【推荐1】如图,点E,F分别是正方形ABCD的对角线AC上的两个动点,∠EBF=45°.求证:EF2=AE2+CF2.
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859491045679104/2859788211617792/STEM/37cc4a20c433404191f027031b653757.png?resizew=147)
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【推荐1】(1)如图,线段
,
,点
从点
开始绕着点
以
的速度顺时针旋转一周回到点
后停止,点
同时出发沿射线
自
点向
点运动,若点
、
两点能恰好相遇,则点
运动的速度为________
;
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061223132438528/2063472164962304/STEM/555858d3d13040c094a0802cfe3faa6a.png?resizew=196)
(2)将一副三角板中的两块直角三角尺的直角顶点
按如图方式叠放在一起(其中,
,
,
;
).将三角尺
固定,另一三角尺
的
边从
边开始绕点
转动,转动速度与(1)问中
点速度相同,当
且点
在直线
的上方时,这两块三角尺是否存在一组边互相平行?若存在,请写出
有可能的值及对应转动的时间;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5900a088a5cd1be523bc797a7a3f6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0426ba7b89ba433dc7a8d9f399d8345a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde2ee0ad7bbe0d30346450a2477653c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d1461f3b7f2a8a65097c8de1dcbfc7.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061223132438528/2063472164962304/STEM/555858d3d13040c094a0802cfe3faa6a.png?resizew=196)
(2)将一副三角板中的两块直角三角尺的直角顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a740ffbb9906ae978955d158e6c4dd4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6f36741b86f464be362b12bac13d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6552d34ebc44037dae72c602f08f64e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5692e756864431de1a25c76745da01e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c941cb13f64020851fd09e0514f2502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/472423862adaa9b1381f5ca1aabb7daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061223132438528/2063472164962304/STEM/54921a8d9b024c06a9f2bcf72e63a7c0.png?resizew=316)
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【推荐2】在平面直角坐标系中,直线
(k是常数,且
)与坐标轴分别交于点A,点B,且点B的坐标为
.
(1)求点A的坐标;
(2)将线段
绕点A顺时针旋转
到
,作直线
交x轴于点C,求直线
的解析式;
(3)在(2)的条件下,如果动点P在x轴上运动,当
的面积是
面积的一半时,求出此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b866297573eebca4c3537aadb71726a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f2be8f1e796226f1b0fa95f6aea35d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/ddbd035f-f0bb-4145-afe0-4f82f06fc560.png?resizew=150)
(1)求点A的坐标;
(2)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)在(2)的条件下,如果动点P在x轴上运动,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7f9f7952c4be18cb73393047c2ad75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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【推荐3】如图1,我们把一副两个三角板如图摆放在一起,其中OA,OD在一条直线上,∠B=45°,∠C=30°,固定三角板ODC,将三角板OAB绕点O按顺时针方向旋转,记旋转角∠AOA'=α(0<α<180°).
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884882115362816/2885878229630976/STEM/f36729a741dd4397a2b6d20e3499414c.png?resizew=488)
(1)在旋转过程中,当α为 度时,A'B'
OC,当α为 度时,A'B'⊥CD;
(2)如图2,将图1中的△OAB以点O为旋转中心旋转到△OA'B'的位置,求当α为多少度时,OB'平分∠COD;
拓展应用:
(3)当90°<α<120°时,连接A'D,利用图3探究∠B'A'D+∠B'OC+∠A'DC值的大小变化情况,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884882115362816/2885878229630976/STEM/f36729a741dd4397a2b6d20e3499414c.png?resizew=488)
(1)在旋转过程中,当α为 度时,A'B'
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如图2,将图1中的△OAB以点O为旋转中心旋转到△OA'B'的位置,求当α为多少度时,OB'平分∠COD;
拓展应用:
(3)当90°<α<120°时,连接A'D,利用图3探究∠B'A'D+∠B'OC+∠A'DC值的大小变化情况,并说明理由.
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