270 degrees: The interior angle of a square is always 90 degrees, and the total around any point such as the vertex of the square is always 360; 360 - 90 = 270.
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Exterior angle of a square is 90 degrees Exterior angle of a regular pentagon is 72 degrees
The measure of the exterior angle.
It is: 180-vertex angle = exterior angle
Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle
Usually, the measure of an exterior angle of a pentagon is greater.