13.20
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0.744182 (rounded)
14
The sum of the exterior angles is always 360 degrees. The sum of the interior angles is (14-2)(180 degrees) or 12x180 which is 2160 degrees.
A pair of supplementary angles add up to 180 degrees. Therefore, the supplement to a 14 degree angle is equal to 180 - 14 = 166 degrees.
14 gon