4
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2 if not a square
The square has 4 sides and has rotational symmetry of order 4.
2 If the rectangle has equal sides (ie it's a square) the order is 4.
order of rotation of semicircle is 1. angle of rotation of semicircle is 360 degree. If you want to find angle of rotation of a shape, then divide 360 from order of rotation of a shape.
if it's not a square, 180 degrees