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正方形绕中心至少旋转 度后能与自身重合．
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一个正方形要绕它的中心至少旋转多少度才能和原来图形重合________
下列正多边形中绕其中心旋转72°后能和自身重合的是
正方形
正五边形
正六边形
正八边形
如图如果正方形ABCD旋转后能与正方形CDEF重合那么图形所在平面内可作为旋转中心的点个数
1个
2个
3个
4个
如图如果正方形ABCD旋转后能与正方形CDEF重合那么图形所在平面内可作为旋转中心的点个数
1个
2个
3个
4个
一个正方形要绕它的中心至少旋转___________度才能和原来的图形重合.
正方形是中心对称图形它绕它的中心旋转一周和原来的图形重合________次.
一个正三角形至少绕其中心旋转_________就能与其自身重合一个正六边形至少绕其中心旋转_____
一个正三角形至少绕其中心旋转_________度就能与其自身重合.
正九边形绕中心点旋转一定的角度后能与自身完全重合则其旋转的角度至少为.
一个等边三角形绕其旋转中心至少旋转度才能与自身重合.
30°
60°
120°
180°
一个正方形绕着它的中心旋转度后就能与它自身重合．
1如图1是两个有一边重合的正三角形那么由其中一个正三角形绕平面内某一点旋转后能与另一个正三角形重合平
一个正方形要绕它的中心至少旋转度才能与原来的图形重合．
如图如果正方形CDEF旋转后能与正方形ABCD重合那么图形所在平面上可以作为旋转中心的点有个
.正方形绕其中心旋转一定的角度与原图形重合则这个角至少为_________度.
如图所示的五角星绕中心点旋转一定的角度后能与自身完全重合则其旋转的角度至少为度.
正方形绕其中心旋转一定的角度与原图形重合则这个角至少为度.
正方形至少旋转度才能与自身重合．
等边三角形绕中心点至少旋转度后能与自身重合正方形绕中心点至少旋转度后能与自身重合
正方形绕其中心旋转一定的角度与原图形重合则这个角至少为度．
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