The sum of the exterior angles of a polygon, with any number of sides (or vertices) is always 360 degrees.
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The exterior angles of a nonagon add up to 360 degrees.
The sum of all the exterior angles of a nonagon is 360 degrees. Any specific exterior angle can have any value between 0 and 360 degrees (except 180) subject the their sum being 360.
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The sum of the exterior angles of any polygon is 360 degrees. this is true whether the figure is regular or irregular, and irrespective of how many sides/vertices it has. For a regular nonagon, the 9 equal external angles sum to 360 degrees and so each measures 360/9 = 40 degrees.
The sum of the interior angles of a nonagon is 1260 degrees.