We conclude that the angle of rotational symmetry is 180°.
For any regular shape that has internal angles measuring θ, the angles of rotational symmetry of that figure are:
A = n*θ
Where n is an integer number (different than zero, because that is the trivial case).
For the case of the rectangle not all the sides measure the same thing, we have internal angles of 90° and opposite sides measure the same.
So we only have rotational symmetry for each two internal angles (2*90° = 180°).
So we conclude that the angle of rotational symmetry is 180°.
If you want to learn more about rotational symmetry:
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