2) pentagonal antiprism |2 2 5 dual: pentagonal deltohedron (3.3.3.5), dihedral group D5, χ=2, D=1 V=10, E=20, F=12=2{5}+10{3} α γ a b c ρ/R r/ρ l/ρ h/r {5} 36.0 72.0000 31.72 63.43 58.28 0.850651 0.525731 0.618034 1.618034 {3} 60.0 36.0000 31.72 37.38 20.91 0.850651 0.934172 0.618034 0.381966