A polygon is regular if it is uniform and its faces are all alike. The regular convex polyhedra are the five Platonic solids, which have been known since classical Greece. The ancient Greek ...

Cubes, cuboids, tetrahedron and prisms are examples of polyhedra. When you open out a polyhedron as a net, it shows all the polygons that it is made from. For example here is the net of a cuboid.