Four.
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No.
There are 90 degrees in a 1/4 of a full turn of 360 degrees
Well, honey, a full turn has 360 degrees, and each right angle is 90 degrees. So, if we divide 360 by 90, we get 4 right angles in a full turn. It's as simple as that, darling.
2 full turns, if one turn is 360 degrees.
0,one full turn doesn't count as a rotational symmetry