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An octagon has interior angles of 1080 degrees.
Total angles: (8-2)*180 = 1080 degrees Each interior angle: 1080/8 = 135 degrees
Sum of exterior angles: 360 degrees Sum of interior angles: 1080 degrees Each exterior angle: 360/8 = 45 degrees Each interior angle: 1080/8 = 135 degrees
Exterior angles: 360 degrees Interior angles: 1080 degrees
Using a protractor an 8 sided octagon angles will add up to 1080 degrees Or use the formula: (n-2)*180 = sum of interior angles whereas 'n' is the number of sides of the polygon