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