Any angle that you like. The only constraint is that the sum of all 18 interior angles is 2880 degrees.
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It is: 180-exterior angle = interior angle
Each interior angle will measure 162 degrees
Each interior angle will measure 156 degrees
It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line
It will have 14 sides and each interior angle will measure 2160/14 degrees