Providing it's a regular polygon:-
Each exterior angle 3.6 degrees
Each interior angle 176.4 degrees
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Providing that it is a regular 12 sided polygon then each exterior angle measures 30 degrees
Each interior angle in 12-sided polygon is 150 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 ============================
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
Each interior angle measures 160 degrees