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An interior angle of a 16-gon can have any value from 0 to 360 degrees - with the exception of 180 degrees.
(16-2)*180 = 2520 degrees
157.5 degrees
Assuming you mean a regular 16-gon (also known as a hexadecagon), the sum of the interior angles is 2520 degrees, or 14 Pi radians.
The sum of the interior angles of a 16-gon is (16-2)*180 = 2520 degrees. The measure of each interior angle cannot be determined unless the polygon is regular.