The angles add up to 3420 degrees. In a regular 21-gon, each angle is about 162.86 degrees.
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The sum of exterior angles, of any polygon - convex or concave, and whatever the number of sides - is 360 degrees or 2*pi radians.
4140Improved Answer:-Exterior angles = 360 degreesInterior angles = 4140 degrees
The exterior angles of any polygon add up to 360 degrees
false but You can find the measure of an exterior angle by using supplementary angles.
I think its this.... Find the interior. Then do 180 - the interior. That is the exterior. * * * * * The correct answer is that the sum of the exterior angles of any polygon is always 360 degrees.