1. The problem asks for the best description of a polygon that is a hexagon with six sides, where all sides are equal in length and all interior angles are equal. 2. A polygon with all sides equal is called equilateral. 3. A polygon with all interior angles equal is called equiangular. 4. When a polygon is both equilateral and equiangular, it is called a regular polygon. 5. Since the hexagon described has all sides equal and all angles equal, it is a regular hexagon. 6. Therefore, the best description of the polygon is "regular".