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The interior angles of an octagon sum to 6*pi radians (1080 degrees).
Exterior angles add up to 360 degrees Interior angles add up to 1080 degrees
The 8 interior angles of an octagon add up to 1,080 degrees.
An octagon has 8 sides and 8 interior angles that add up to 1080 degrees.
(sides-2)*180=the total angle of the shape. So octagon (8-2)*180=1080 Just like a triangle (3-2)*180