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The interior angles of a 16 sided polygon add up to 2520 degrees If it's a regular polygon then each interior angle measures 157.5 degrees
A polygon that has a sum of 2520 degrees of interior angles has 16 sides
(16-2)*180 degrees = 2520 degrees.
The central angle of a n-sided regular polygon = 360 degrees / n. Hence, the central angle of a 15-sided regular polygon = 360 degrees / 15 = 24 degrees ============================
That's true if the interior angles are 108 degrees, but a regular polygon cannot have exterior angles of 108 degrees.