Small_hexacronic_icositetrahedron Knowpia

Small hexacronic icositetrahedron

Type	Star polyhedron
Face
Elements	F = 24, E = 48 V = 20 (χ = −4)
Symmetry group	O_h, [4,3], *432
Index references	DU₁₃
dual polyhedron	Small cubicuboctahedron

In geometry, the small hexacronic icositetrahedron is the dual of the small cubicuboctahedron. It is visually identical to the small rhombihexacron. A part of each dart lies inside the solid, hence is invisible in solid models.

Proportions edit

Its faces are darts, having two angles of $\arccos({\frac {1}{4}}+{\frac {1}{2}}{\sqrt {2}})\approx 16.842\,116\,236\,30^{\circ }$ , one of $\arccos({\frac {1}{2}}-{\frac {1}{4}}{\sqrt {2}})\approx 81.578\,941\,881\,85^{\circ }$ and one of $360^{\circ }-\arccos(-{\frac {1}{4}}-{\frac {1}{8}}{\sqrt {2}})\approx 244.736\,825\,645\,55^{\circ }$ . Its dihedral angles equal $\arccos({\frac {-7-4{\sqrt {2}}}{17}})\approx 138.117\,959\,055\,51^{\circ }$ . The ratio between the lengths of the long edges and the short ones equals $2-{\frac {1}{2}}{\sqrt {2}}\approx 1.292\,893\,218\,81$ .