First, let's look at the interior angles of regular polygons. A regular polygon has all congruent sides and angles, for example an equilateral triangle or a square.
What if the polygon is irregular? Construct an irregular polygon and find out.
What if it is concave? Construct a concave polygon and find out.
Remember: How do we define concave and convex?
What if it is concave? Construct a concave polygon and find out.
Remember: How do we define concave and convex?