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i rilly dont no is it (n-2)*180?? <--- that's actually for finding the Interior Angles for geometry.
the way I remember rotational symmetry is as follows:
each shape has to add up to 360 degrees, so you take that and divide it by the number of sides of the shape. Then, you keep adding that answer till you come get to 360.
Example:
The rotational symmetry for an Octagon:
360/8 = 45
45 + 45 = 90
90 + 45 = 135
135 + 45 = 180
180 + 45 = 225
225 + 45 = 270
270 + 45 = 315
315 + 45 = 360
The degrees for Rotational Symmetry are: 45, 90, 135, 180, 225, 270, 315, and 360.
Hope that helps, because it's what helps me.
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