一个正三角形至少绕其中心旋转________ 度,就能与其自身重合.
更新时间:2024-01-14 21:56:40
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【推荐1】如图,在菱形
中,
,
,
分别在边
,
上,
,将
沿
折叠,点
落在
的延长线上的点
处,则
的度数为______ .
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【推荐2】如图,已知
中,
,
,
,
,
,点
为直线
上一动点,将线段
绕点
顺时针旋转
得到线段
,连接
、
,点
在直线
上且
,则
最小值为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】如图,
是
的弦,点C在
上,以
为边作等边三角形
,点A在圆内,且
恰好经过点O,其中
,
,则
的长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图,已知Rt△OAB,∠OAB=90°,∠ABO=30°,斜边OB=4,将Rt△OAB绕点O顺时针旋转60°到Rt△ODC,连接BC,AC.作OP⊥AC,垂足为P,则OP的长度为_______ .
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【推荐1】正十二边形绕着它的中心至少旋转________ 度,能与它本身重合.
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【推荐2】等边三角形至少旋转_________ 度才能与自身重合.
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