-- The exterior angles of a polygon add up to 360 degrees, no matter how many of them there are.
-- The interior angles of a polygon add up to [ (180) times (number of sides minus 2) ].
-- These are both true whether or not the polygon is 'regular'.
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That's true if the interior angles are 108 degrees, but a regular polygon cannot have exterior angles of 108 degrees.
8 and it is called a regular octagon
6
The central angle of a n-sided regular polygon = 360 degrees / n. Hence, the central angle of a 15-sided regular polygon = 360 degrees / 15 = 24 degrees ============================
No matter how many sides it has, the exterior angles of a regular polygon add up to 360 degrees. So 360/17.14 = 21 sides.