4) pentagrammic antiprism |2 2 5/2 dual: pentagrammic deltohedron (3.3.3.5/2), dihedral group D5, χ=2, D=2 V=10, E=20, F=12=10{3}+2{5/2} α γ a b c ρ/R r/ρ l/ρ h/r {3} 60.0 50.5051 49.61 61.59 42.74 0.647936 0.734401 1.175571 0.924176 {5/2} 72.0 28.4848 49.61 53.22 22.46 0.647936 0.924176 1.175571 0.413304