The following is true of all polygons:
-It is made up of straight line segments
-It is 2-D
-It is a closed figure, and thus has an area
-Its angles add up to (n-2)x180 when n is the number of sides it has, unless it has a crossover.
But "regular", when referring to a polygon, means that all of its sides are
the same length, which also means that all of its angles are the same size; thus also:
-It is convex.
-its sides are congruent.
-its angles have equal measures
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any regular polygon
true.. and polygon
Any polygon can have, and every regular polygon has.
That's true if the interior angles are 108 degrees, but a regular polygon cannot have exterior angles of 108 degrees.
-- 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'.