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3060 degrees
The interior angles of a 19 sided polygon add up to 3060 degrees
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 180 x 17 = 3060 3060/19 = 161.05
19
180n - 360 = 2700 so n = 3060/180 = 17 which is the number of sides. This works because the interior angles of any n-sided polygon total (180n - 360) degrees, usually expressed as "(2n - 4) right angles"