It is (n-2)*180 degrees.
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180 * n - 360
The sum of the interior angles is (n-2)*180 degrees.
The sum of the interior angles of an n-gon (regular or irregular) = (n-2)*180 = 1080 Therefore (n - 2) = 8 and so n = 10.
180(n-2) for sum and {180(n-2)}/n for an individual angle.
It is: (number of sides -2)*180 = sum of interior angles If its a regular polygon then: sum of interior angles/number of sides = each interior angle