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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It can have any value at all. A definite value can be determined if the polygon is regular, but there is no justification for assuming that to be the case.
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.