阅读材料:坐标平面内,把点
绕原点
逆时针旋转
度,得到点
,若已知
点坐标及
的大小,我们可根据公式
来计算点
的坐标.根据材料完成:如图,
,
,
是
上的三点且
,若
点坐标为
,则
点坐标为( )
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566068063682560/2566808240644096/STEM/ab02814073614fd2a5a1d3029727cf32.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057b7f8c6c6a99b1cd14ca179edde85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b28fa22899cd1f3bbb3796aed69a1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63924bcca08db1ce0597f61c1c67519a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226f414789696033c9974764188e9f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7f7c6cc239c887a9303dc0d1cb4054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566068063682560/2566808240644096/STEM/ab02814073614fd2a5a1d3029727cf32.png?resizew=174)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2020-10-08 22:07:38
|
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【推荐1】如图,AB是半径为1的⊙O的直径,点C在⊙O上,∠CAB=30°,D为劣弧CB的中点,点P是直径AB上一个动点,则PC+PD的最小值为( )
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名校
【推荐2】已知⊙O,如图,
(1)作⊙O的直径AB;
(2)以点A为圆心,AO长为半径画弧,交⊙O于C,D两点;
(3)连接CD交AB于点E,连接AC,BC.
根据以上作图过程及所作图形,有下面三个推断:①
;②
;③
.其中正确的推断的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/11/9/2593701269684224/2612164367695872/STEM/00cccbb40fc34f1381fcf734a5200696.png?resizew=157)
(1)作⊙O的直径AB;
(2)以点A为圆心,AO长为半径画弧,交⊙O于C,D两点;
(3)连接CD交AB于点E,连接AC,BC.
根据以上作图过程及所作图形,有下面三个推断:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686171942bd7698035016c732db43b63.png)
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【推荐1】△ABC中,∠C=30°,AC=6,BD是△ABC的中线,∠ADB=45°,则AB=( )
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【推荐2】如图1所示,动点P从正六边形的A点出发,沿A→B→C→D→E以1cm/s的速度匀速运动到点E,图2是点P运动时,
的面积
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