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No - a pentagon has 120 degree rotational symmetry.
No, it does not.
Yes, a square has rotational symmetry. It has rotational symmetry of order 4, which means it can be rotated by 90 degrees, 180 degrees, and 270 degrees to coincide with its original position.
Yes.Yes.Yes.Yes.
When you rotate it around a point found in the middle of the figure 180 degrees. For example, H does have rotational symmetry however, E doesn't