The sum of the internal angles of an n-sided polygon is (n-2)*180 degrees.
So, for a regular polygon, each internal angle is (n-2)*180/n degrees.
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the center angle of any polygon is 360 degrees
Each central angle is (360) divided by (number of sides in the polygon).
A regular polygon with each interior angle measuring 120 degrees is a hexagon.
The smallest internal angle possible for a regular polygon is 60 degrees. So either the angle is not 12 degrees or it is not an internal angle.
Each interior angle will measure 162 degrees