Mark M. answered 01/11/15
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Since you give both 24 and 25 I choose 24
The sum of the exterior angles of all polygons is 360°
The sum of the interior angles of a polygon is (n - 2)180°, where n = number of sides
For a 24-gon the interior angles sum to 22 · 180, or 3960°
The sum of the interior and exterior angles is 3960 + 360 or 4320°.