Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a ...

All the faces of a platonic solid are congruent. Platonic solids close platonic solidA polyhedron with regular polygon faces. These are the tetrahedron, cube, octahedron, dodecahedron and icosahedron.