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The sum of the angles of an 8 sided octagon add up to 360 degrees
The sum of the exterior angles of any polygon - no matter how many sides, no matter whether it is convex or concave - is 360 degrees.
180 x (7-2) = 900 degrees Actually that is the formula for interior angles. All figures have a sum of 360 degrees for their exterior angles.
The sum of the exterior angles of a polygon is equal to 360 degrees.