- Snub dodecadodecahedron
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Snub dodecadodecahedron Type Uniform star polyhedron Elements F = 84, E = 150
V = 60 (χ = −6)Faces by sides 60{3}+12{5}+12{5/2} Wythoff symbol |2 5/2 5 Symmetry group I, [5,3]+, 532 Index references U40, C49, W111
3.3.5/2.3.5
(Vertex figure)
Medial pentagonal hexecontahedron
(dual polyhedron)In geometry, the snub dodecadodecahedron is a nonconvex uniform polyhedron, indexed as U40. It is given a Schläfli symbol s{5/2,5}, as a snub great dodecahedron.
Cartesian coordinates
Cartesian coordinates for the vertices of a snub dodecadodecahedron are all the even permutations of
- (±2α, ±2, ±2β),
- (±(α+β/τ+τ), ±(-ατ+β+1/τ), ±(α/τ+βτ-1)),
- (±(-α/τ+βτ+1), ±(-α+β/τ-τ), ±(ατ+β-1/τ)),
- (±(-α/τ+βτ-1), ±(α-β/τ-τ), ±(ατ+β+1/τ)) and
- (±(α+β/τ-τ), ±(ατ-β+1/τ), ±(α/τ+βτ+1)),
with an even number of plus signs, where
- β = (α2/τ+τ)/(ατ−1/τ),
where τ = (1+√5)/2 is the golden mean and α is the positive real root of τα4−α3+2α2−α−1/τ, or approximately 0.7964421. Taking the odd permutations of the above coordinates with an odd number of plus signs gives another form, the enantiomorph of the other one.
See also
External links
Star-polyhedra navigator Kepler-Poinsot polyhedra
(Nonconvex regular polyhedra)Uniform truncations of Kepler-Poinsot polyhedra Nonconvex uniform Hemipolyhedra Duals of nonconvex uniform polyhedra medial rhombic triacontahedron · small stellapentakis dodecahedron · medial deltoidal hexecontahedron · small rhombidodecacron · medial pentagonal hexecontahedron · medial disdyakis triacontahedron · great rhombic triacontahedron · great stellapentakis dodecahedron · great deltoidal hexecontahedron · great disdyakis triacontahedron · great pentagonal hexecontahedronDuals of Nonconvex uniform
(Infinite stellations)tetrahemihexacron · hexahemioctacron · octahemioctacron · small dodecahemidodecacron · small icosihemidodecacron · great dodecahemidodecacron · great icosihemidodecacron · great dodecahemicosacron · small dodecahemicosacronThis polyhedron-related article is a stub. You can help Wikipedia by expanding it.