The number of angles (n) minus 2 times 180 or (n-2)180
For example a decagon has 10 angles so you would take
(10-2)180
(8)180
1440
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The question has been asked "What is the angle sum of a thirteen sided polygon?" The answer to this question is 1980 degrees. The sum of the interior angles of a polygon of n sides = 180(n - 2)
A pentagon
15
(n-2)(180) use that formula to find the sum of the interior angles of a polygon in degree
The sum of the exterior angles of any polygon, including a 27 sided one, is 360 degrees.