Each external angle of a square is 270o (360o - 90o).
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Each of the 4 interior angles measure 90 degrees
There are 4 internal angles in a square, and they are each 90o angles. There are also 4 external angles, though they are not addressed often. Each of the external angles is a 270o angle. A square is a four-sided figure which has four equal sides and four right-angles.
A rectangle or a square.
Each angle measures 60 degrees
Sum of external angles of a polygon = 360 degrees. So for a regular 16-gon, each EXTERNAL angles = 360/16 = 22.5 degrees. So each internal angle = 180 - external angle = 180 - 22.5 = 157.5 degrees.