The interior angles of a polygon (regular or not) with n sides sum to (n - 2)*180 degrees.
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Its 5 interior angles add up to 540 degrees
They add up to 2,520 degrees
The total interior angles add up to 1260 degrees.
Each interior angle measures 108 degrees and the 5 angles of the regular pentagon add up to 540 degrees
Exterior angles add up to 360 degrees Interior angles add up to 1440 degrees