Studies into Polyhedra - Regular

Look around the Graphics Lab

Regular, Semi-Regular Polyhedra, and thier Duals (first page)
Prisms, Anti-prisms, Pryamids, and related Polyhedra
Miscellanous Polyhedra: Deltahedra
Johnson Solids -- The other convex polyhedra with regular faces

Why I studied polyhedra, and Image Generation Techniques
Known Polyhedral Mathematical Formula
Data Sources and links for Polyhedral Data

Regular and Semi-Regular Solids

On this first page I present the Regular (Platonic), Semi-Regular (Archimedian) and their mathematical Duals. So as to just present the results I have move the details of my study to a separate page (See link above). It is recomended reading, as it explains a lot of the results below, including how images are generated.

Platonic Solids (5) -- Regular Polyhedra

Name V F E F-Type Truncation Dual tetrahedron 4 4 6 triangles truncated tetrahedron tetrahedron cube 8 6 12 squares truncated cube octahedron octahedron 6 8 12 triangles truncated octahedron cube dodecahedron 20 12 30 pentagons truncated dodecahedron icosahedron icosahedron 12 20 30 triangles truncated icosahedron dodecahedron
tetrahedron off vrml	cube off vrml	octahedron off vrml	dodecahedron off vrml	icosahedron off vrml
All vertices, edge mid-points and face mid-points lie on concentric spheres All faces are the same shape and are all regular polygons Thus all edges are equal in length and face corners equal in angle. Duals are also all Plationic Solids. The cube is also called a hexahedron

Archimedean Solids (13) Semi-Regular Polyhedra

tetrahedral symmetry Name V F E Truncation Generates truncated tetrahedron 12 8 18
	truncated_tetrahedron off vrml
cub-octahedral symmetry Name V F E Truncation Generates truncated cube 24 14 36 truncated octahedron 24 14 36 cuboctahedron 12 14 24 rhombicuboctahedron rhombicuboctahedron 24 26 48 great rhombicuboctahedron great rhombicuboctahedron 48 26 72 snub cuboctahedron 24 38 60
truncated_cube off vrml	truncated_octahedron off vrml	cuboctahedron off vrml
	rhombicuboctahedron off vrml	great_rhombicuboctahedron off vrml	snub_cuboctahedron off vrml
icosi-dodecahedral symmetry Name V F E Truncation Generates truncated dodecahedron 60 32 90 truncated icosahedron 60 32 90 icosidodecahedron 30 32 60 rhomb-icosidodecahedron rhombicosidodecahedron 60 62 120 great rhomb-icosidodecahedron great rhombicosidodecahedron 120 62 180 snub icosidodecahedron 60 92 150
truncated_dodecahedron off vrml	truncated_icosahedron off vrml	icosidodecahedron off vrml
	rhombicosidodecahedron off vrml	great_rhombicosidodecahedron off vrml	snub_icosidodecahedron off vrml
All faces are regular polygons but not of same shape. All edges are equal in length. All vertices have the same number of edges attached (usally 3) All vetrices and edges are co-spheric. BUT NOT face mid points! The "truncated icosahedron" is more commonly known as a soccer ball The "cuboctahedron" is produced if the truncation of the "cube" and/or "octahedron" continues in sequence. Simularly for the "icosi-dodecahedron" for the "dodecahedron" and/or "icosahedron". Truncation is the term commonly used but as true truncation can produce rectangular faces. The correct term is rombic, where the rectanges are modified to more regular squares. By doing this the resulting archimedean solid retains the regular polygonal faces, and the "all edges of equal length" fact. The "snub cuboctahedron" (sometimes called "snub cube") has a left and right-handed version. As does the "snub icosidodecahedron" (or "snub dodecahedron") A "irregular rhombicuboctahedron" (also called a "elongated square gyrobicupola" - J37), also exists, where one section is given a 45 degree twist (caution is advised is building). Similarally an "irregular cuboctahedron" (or "triangular orthobicupola - J28), and "irregular icosidodecahedron" (or "pentagonal orthobirotunda" - J34), also exist by twisting two equal halves, of these objects.

Archimedean Duals (13)

Archimedean Dual of the Archimedean F Type triakis tetrahedron truncated tetrahedron 12 triangles triakis octahedron truncated cube 24 triangles tetrakis hexahedron truncated octahedron 24 trianlges triakis icosahedron truncated dodecahedron 60 triangles pentakis dodecahedron truncated icosahedron 60 triangles
triakistetrahedron off vrml	triakisoctahedron off vrml	tetrakishexahedron off vrml
		triakisicosahedron off vrml	pentakisdodecahedron off vrml
rhombic dodecahedron cuboctahedron 12 rhombus kite icositetrahedron small rhombicosidodecahedron 24 kites disdyakis dodecahedron great rhombicosidodecahedron 48 triangles pentagonal icositetrahedron snub cuboctahedron 24 tears
rhombic_dodecahedron off vrml	kite_icositetrahedron off vrml	disdyakis_dodecahedron off vrml	pentagonal_icositetrahedron off vrml
rhombic tricontahedron icosidodecahedron 30 rhombus kite hexacontahedron small rhombicosidodecahedron 60 kites disdyakis triacontahedron great rhombicosidodecahedron 120 triangles pentagonal hexacontahedron snub dodecahedron 60 tears
rhombic_triacontahedron off vrml	kite_hexecontahedron off vrml	disdyakis_triacontahedron off vrml	pentagonal_hexecontahedron off vrml
Face descriptions: triangles are isosceles triangles rhombus are equal sided parallogram or diamond shaped quadlaterials. kites are diagonally mirror symetrical quadlaterials, EG: or kite shaped. tears are roughly hexagonal shaped with two sides extended to remove one point, EG: a tear shaped symetrical pentagon.
Faces are NOT regular polygons, but are all symetrical in some way. EG: isosceles triangles, rather than equalateral triangles. All faces in an object are the same size, shape, and co-spheric. IE: they make good, unusual looking dice! Edge mid-points and vertices are NOT co-spheric. As the two "snub" archmidean solids have left and right versions, their duals, also have left and right versions. EG: left and right versions of the "pentagonal icositetrahedron" and "pentagonal hexacontahedron". The phrase xx-aconta-xx means ten, EG tri-contra means 30. The phrase xx-akis-xx means a face has a low pyramid built on it, EG: tri-akis means 3 triangles forming a low pyramid on a triangular face George Heart uses the phase disdyakis-xx, which is a low four sided pyramid (like a tetrakis-xx) but on a rombic or diamond shaped face. Naming objects by pyramid building on simpler objects is not without problems. A "disdyakis-dodecahedron" (pyramids on 12 rombic faces) is often called a "hexakis-octahedron" (octahedron basied), or even a "octakis-hexahedron" (cube based). It all depends on how you look at the object. The same goes for the "disdyakis-triacontahedron", which can be called a "hexakis-icosahedron" or just as easilly, "decakis-dodecahedron". NOTE: I named the above objects as "kite_xx", though traditionally they are named "trapezoidal_xx". The term trapezoidal is standardly used to refer to "kite-shaped" quadrilaterals, which have two pairs of adjacent sides of equal length (and so are not trapezoids by the modern American definition which requires that one pair of opposite sides be parallel).