10) octahedron 4|2 3 [17,2]
dual: cube
(3.3.3.3), octahedral group S4, χ=2, D=1
V=6, E=12, F=8=8{3}
α γ a b c ρ/R r/ρ l/ρ h/r
{3} 60.0 45.0000 45.00 54.74 35.26 0.707107 0.816497 1.000000 0.707107