In general, you cannot. All that you can say for a polygon with n sides is that the angles sum to (n-2)*pi radians - or (n-2)*180 degrees. This is true for cocave polygons as well as convex ones.
For a concave polygon, if you wish to measure a reflex angle using a protractor, measure the outside angle and subtract that from 2*pi radians (360 degrees).
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No. It is impossible.The definition of a regular polygon is a polygon with equal angles, and equal sides.For a polygon to be concave, it has to have at least one angle more than 180 degrees, and a a polygon cannot consistently have angles more than 180 degrees.
A concave polygon is a polygon with at least one interior angle greater than 180 degrees. This causes the polygon to have at least one "dent" or indentation in its shape. The presence of these interior angles greater than 180 degrees distinguishes concave polygons from convex polygons, which have all interior angles less than 180 degrees.
The sum of the exterior angles of ANY polygon, convex or concave, is 360 degrees.
Not all are. Not only is it a concave shape, but the interior angles can vary. For a polygon to be regular, it must be equilateral and equiangular.
The sum of exterior angles, of any polygon - convex or concave, and whatever the number of sides - is 360 degrees or 2*pi radians.