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A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
1800 degrees (that is the sum of the internal angles of the 12-sided polygon).
A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.
(number of sides -2)*180 = sum of interior angles
30 sides