Click on the link below to read Clinton's Equal Central Angle Conjecture, a 9 page PDF paper on Goldberg polyhedra by BFI board member Joe Clinton. "In 1937 Michael Goldberg introduced 'a class of multi-symetric polyhedra' consisting of twelve pentagons, eight quadrilaterals or four triangles and all additional faces being hexagons. Thus he introduced the fact that 'trihedral polyhedrea which posses the same number of hexagonal faces in addition to 12 (8, or 4) regularily and symmetrically disposed pentagons (quadrilaterals, or triangles) can be topologically different'"

» Click here to read the paper
» Click here to see models resulting from the chord factors for a 3-f geodesic inner sphere inside a Goldberg polyhedron at megadome.com