如图,菱形OABC的一条边OA在x轴上,将菱形OABC绕原点O顺时针旋转75°至OA′B′C′的位置,若OA=2,∠C=120°,则点B′的坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/a9c1d33a-3e05-40bc-a9a6-fd210f608826.png?resizew=153)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/a9c1d33a-3e05-40bc-a9a6-fd210f608826.png?resizew=153)
A.(![]() ![]() | B.(![]() ![]() | C.(3,![]() | D.(3,﹣![]() |
更新时间:2019-06-21 19:17:19
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【推荐1】在平面直角坐标系中,关于点
的图象变化有以下说法:
①点
关于
轴的对称点
的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73ef9855a4dcbf09d87f13ac3bc715.png)
②点
与点
关于原点对称
③把点
先向右平移
个单位长度,再向下平移
个单位长度得到点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874c0c7efab1803d18c887d90d5f3823.png)
④把点
绕原点顺时针旋转
,得到点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18032afea3393a6cef86aa99256faf13.png)
其中,正确的说法是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4bd53db9a694de189001c16123bab5.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73ef9855a4dcbf09d87f13ac3bc715.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0adfa7bbcc9176b4c031f397f4de742.png)
③把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874c0c7efab1803d18c887d90d5f3823.png)
④把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a0eb6045369a13358f2d5999f7bc3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18032afea3393a6cef86aa99256faf13.png)
其中,正确的说法是( )
A.①③④ | B.①②③④ | C.①②③ | D.②③④ |
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【推荐2】矩形
在坐标系中的位置如图所示,
,
,把矩形
绕着原点顺时针旋转
得到矩形
,则点
的坐标为( )
![](https://img.xkw.com/dksih/QBM/2018/11/1/2066427326693376/2066914887245824/STEM/95737d472038434190c48bab9c890323.png?resizew=102)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132de9682ce9a412b7b517aa209726ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89b18c30d999ccaea459bfee317bd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c916293b9d6c6f900869c4a222adf4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132de9682ce9a412b7b517aa209726ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12d93bd1130088b622602a6c21c9c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b62826c056d2d3d7443ffb05b389107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ed513f56811aa1d314514c5c10d90a.png)
![](https://img.xkw.com/dksih/QBM/2018/11/1/2066427326693376/2066914887245824/STEM/95737d472038434190c48bab9c890323.png?resizew=102)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】边长为1的小正方形构成的网格中,半径为1的
在格点上,设
,
.则下列等式正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/11/29/2344258659155968/2344335078924288/STEM/b53b14b623e34fc8a690ffda59ee13d7.png?resizew=106)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32970e65ae53652d47bd4dae1726d19c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd317aba4868c05e3cb3f16f402fb9fb.png)
![](https://img.xkw.com/dksih/QBM/2019/11/29/2344258659155968/2344335078924288/STEM/b53b14b623e34fc8a690ffda59ee13d7.png?resizew=106)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
是
的外接圆,
的半径
,
,则弦
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/76f8616e-ea7b-450c-a30c-817409cd4dd6.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658f7ea778c21720671067b393865b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8176754726d2194c890e80df1a1f1c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca5f6366db8d915043332f818b65d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/76f8616e-ea7b-450c-a30c-817409cd4dd6.png?resizew=125)
A.![]() | B.![]() | C.![]() | D.![]() |
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