Total sum add up to 360 degrees.
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The sum of the measures of the exterior angles of an octagon (and any polygon) is 360o.
If its a regular hexadecagon then each of its 16 exterior angles measures 22.5 degrees
The exterior angles of any polygon add up to 360.
If exterior angles are 120 then interior angles must be 60 so you have an equilateral triangle
The sum of a regular polygons exterior angles always = 360