All polygons, including an undecagon (11-sided figure) have a sum of exterior angles of 360 degrees.
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The sum of the exterior angles of a polygon is 360o.
The exterior sum of the angles of any polygon including a triangle is always 360 degrees.
The sum of the exterior angles of a polgon - no matter how many sides - is 360 degrees.
Sum of exterior angles: 360 degrees Sum of interior angles: 2160