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.
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The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.
Each interior angle measures 108 degrees
It will have 10 sides and each interior angle measures 144 degrees while each exterior angle measures 36 degrees
120
120°.