Convex polygon or regular star polygon whose sides are congruent and whose interior angles are congruent.
- A regular polygon has as many lines of symmetry as it has sides or vertices.
- A polygon that is not a regular polygon is called an irregular polygon.
- A regular polygon may be convex or non-convex.
- All regular star polygons are non-convex polygons. They should not be confused with regular polygons.
- An equilateral triangle is a regular polygon.
- A square is a regular polygon.