An interior angle of a 16-gon can have any value from 0 to 360 degrees - with the exception of 180 degrees.
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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.
157.5 degrees
Interior angle measure of a 18-gon = [180⁰(18 - 2)]/18 = 10⁰(16) = 160⁰. Exterior angle measure = 180⁰ - 160⁰ = 20⁰.
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.
Assuming it's regular: 157.5°