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-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The sum of the internal angles always equals 180o
The sum of the angles in a nonagon total 1260 degrees.
Sum of interior angles of an octagon= 1080˚
The sum of the interior angles is 360.