For internal angles, the formula is (n-2) x180 / (divide by) n where n= number of sides; for external, it is 180n+360.
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The sum of the exterior angles of any polygon is 360 degrees.
360o; the sum of the exterior angles of any polygon is 360, as given in the formula E = 360.
(n-2)(180) use that formula to find the sum of the interior angles of a polygon in degree
The sum of the interior angles of a regular prism is 4*pi = 12.56637 steradians or 41253 square degrees.
Sum of interior angles of n-sided polygon is (2n - 4) right angles or 180n - 360 degrees and you may commonly see this written in an equivalent form 180(n-2) degrees. Sum of exterior angles is always 360 degrees.