Small ditrigonal dodecacronic hexecontahedron

In geometry, the small ditrigonal dodecacronic hexecontahedron (or fat star) is a nonconvex isohedral polyhedron. It is the dual of the uniform small ditrigonal dodecicosidodecahedron. It is visually identical to the small dodecicosacron. Its faces are darts. A part of each dart lies inside the solid, hence is invisible in solid models.

Small ditrigonal dodecacronic hexecontahedron

Type	Star polyhedron
Face
Elements	F = 60, E = 120 V = 44 (χ = −16)
Symmetry group	I_h, [5,3], *532
Index references	DU₄₃
dual polyhedron	Small ditrigonal dodecicosidodecahedron

3D model of a small ditrigonal dodecacronic hexecontahedron

Proportions

Faces have two angles of $\arccos({\frac {5}{12}}+{\frac {1}{4}}{\sqrt {5}})\approx 12.661\,078\,804\,43^{\circ }$ , one of $\arccos(-{\frac {5}{12}}-{\frac {1}{60}}{\sqrt {5}})\approx 116.996\,396\,851\,70^{\circ }$ and one of $360^{\circ }-\arccos(-{\frac {1}{12}}-{\frac {19}{60}}{\sqrt {5}})\approx 217.681\,445\,539\,45^{\circ }$ . Its dihedral angles equal $\arccos({\frac {-44-3{\sqrt {5}}}{61}})\approx 146.230\,659\,755\,53^{\circ }$ . The ratio between the lengths of the long and short edges is ${\frac {31+5{\sqrt {5}}}{38}}\approx 1.110\,008\,944\,41$ .

References

Wenninger, Magnus (1983), Dual Models, Cambridge University Press, ISBN 978-0-521-54325-5, MR 0730208

External links

Weisstein, Eric W. "Small ditrigonal dodecacronic hexecontahedron". MathWorld.

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