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x + 8
octogan
the sum of the internal angles of an 8 sided shape is; number of sides (8) subtract 2 (8-2=6) multiply by 180 (6x180=1080)
1080 degrees
sum interior angles = (number of sides - 2) × 180°= (8 - 2) × 180°= 1080°The sum of the interior angles of an octagon is 1080°In a regular octagon, divide by 8 for each angle = 135°.