Definition that contains regular polygon
- square (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon
- foursquare (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon
- regular convex solid any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- platonic body any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- regular polyhedron any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- equiangular triangle a three-sided regular polygon
- platonic solid any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- equilateral triangle a three-sided regular polygon
- regular convex polyhedron any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- hexagram a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles