如图,正方形A B C D的A点和C点都在x轴的正半轴上,A点的坐标为(
-1,0).将正方形ABCD以点B为旋转中心顺时针旋转120°,点D恰好落在y轴的正半轴上(D1点处),得到正方形A1 B1 C1 D1,则D1点的坐标为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/9a1bf02f-bf87-4168-b64b-97c4e2ff8fee.png?resizew=195)
2020·山东济宁·二模 查看更多[2]
更新时间:2020-06-24 06:22:24
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【推荐1】如图,直线
与x轴、y轴分别交于A、B两点,以
为边在第二象限作正方形
,已知双曲线
过点D,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
_______ .
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【推荐2】如图,在平面直角坐标系xOy中,点A、C、F在坐标轴上,E是OA的中点,四边形AOCB是矩形,四边形BDEF是正方形,若点C的坐标为
,则点E的坐标为______________ .
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【推荐1】如图,O为直线
上一点,作射线
,使
,将一个直角三角尺如图摆放,直角顶点在点O处,一条直角边
在射线
上.将图①中的三角尺绕点O以每秒
的速度按逆时针方向旋转(如图②所示),设旋转时间为t秒
时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c72a6fd5f03cb308330572fc259116.png)
_________
(2)在旋转一周的过程中,
所在直线恰好平分
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(2)在旋转一周的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
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【推荐2】如图,△ABC、△ADE都是等腰直角三角形.点C在边AE上,AB=AC=
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【推荐1】如图,矩形
的顶点A在反比例函数
的图象上,对角线
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【推荐2】△ABC内接于⊙O,AB为⊙O的直径,将△ABC绕点C旋转到△EDC,点E在⊙上,已知AE=2,tanD=3,则AB=__________ .
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