Each exterior angle is 360/13 = 27.7 degrees rounded to 1 decimal place
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360/number of sides = exterior angle
A regular polygon that has an exterior angle of 60 degrees = 360/60 = 6 sides and it is an hexagon
If those are exterior angles, the exterior angles of any polygon add up to 360. That would be 20 sides.
180-interior angle = exterior angle If it's a regular polygon then: 360/number of sides = exterior angle
15 sides