27) icosahedron 5|2 3 [25,4]
dual: dodecahedron
(3.3.3.3.3), icosahedral group A5, χ=2, D=1
V=12, E=30, F=20=20{3}
α γ a b c ρ/R r/ρ l/ρ h/r
{3} 60.0 36.0000 31.72 37.38 20.91 0.850651 0.934172 0.618034 0.381966