WORD,TYPE,IMPORTANCE,DEFINITION Triangle,polygon,10,3 sided Quadrilateral,polygon,8,4 sided Pentagon,polygon,8,5 sided Hexagon,polygon,8,6 sided Octagon,polygon,4,8 sided Tetrahedron,polyhedron,9,4 triangles Cube,polyhedron,10,6 squares Octahedron,polyhedron,9,8 triangles Dodecahedron,polyhedron,8,12 pentagons Icosahedron,polyhedron,8,20 triangles