Exterior angles add up to 360 degrees
Interior angles add up to 4140 degrees
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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 interior angles is 360.
Sum of interior angles of an octagon= 1080˚
The sum of the angles in a nonagon total 1260 degrees.