For rotation symmetry, the order of any regular polygon is the number of sides. The angle of rotation would be 360 degrees divided by that order. For example, an octagon is an 8-sided figure, so the order is eight. If you divide 360 by 8, you get 45, which means the octagon has an angle of rotation of 45 degrees.
【How-to】What is the order of rotational symmetry of an octagon
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