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If it is a regular 8 sided octagon then each exterior angle is 45 degrees and each interior angle is 135 degrees.
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.
60 degrees in each angle
Each exterior angle is 30 degrees and each interior angle is 150 degrees
If each exterior angle is 30 degrees the polygon has 360/30 = 12 sides.