A regular 10 sided decagon has 10 interior angles that add up to 1440 degrees and each interior angle is 1440/10 = 144 degrees
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An obtuse angled triangle can have can have one internal angle of 120 degrees.
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.
360 degrees take away the internal angle
3o decagons
The internal angle of any polygon with n sides is equal to (n - 2) x 180 / n degrees. For example, each internal angle of a square is equal to (4 - 2) x 180 = 360/4 = 90 degrees.