No, regular polygons are always convex and are shapes constructed using straight lines.concave polygons are irregular.
I don't. Think they are.
A closed, plain figure bounded by three or more line segments. These lines cannot be curved and they cannot intersect. A polygon must also fall on a single plane.
It must be a plane figure.It must be closed.It must be bounded by straight lines.These straight lines must not cross one another.
All its angles are of the same measure and all its sides are congruent.