Only five Polyhedrons? Forums Main Page › Forums Main Page › Geometry › Solid Figures › Polyhedron Fundamentals › Only five Polyhedrons? This topic has 0 replies, 1 voice, and was last updated 11 years, 3 months ago by Sharma. Viewing 0 reply threads Author Posts July 30, 2013 at 7:32 pm #1525 SharmaKeymaster Worth noting that in Euclid’s Elements, it was proven that there can be no other regular polyhedron beyond the tetrahedron, octahedron, hexahedron, icosahedron, and dodecahedron. Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In