Английская Википедия:Great ditrigonal dodecacronic hexecontahedron
Шаблон:Short description Шаблон:Uniform polyhedra db
In geometry, the great ditrigonal dodecacronic hexecontahedron (or great lanceal trisicosahedron) is a nonconvex isohedral polyhedron. It is the dual of the uniform great ditrigonal dodecicosidodecahedron. Its faces are kites. Part of each kite lies inside the solid, hence is invisible in solid models.
Proportions
Kite faces have two angles of <math>\arccos(\frac{5}{12}-\frac{1}{4}\sqrt{5})\approx 98.183\,872\,491\,81^{\circ}</math>, one of <math>\arccos(-\frac{5}{12}+\frac{1}{60}\sqrt{5})\approx 112.296\,452\,073\,54^{\circ}</math> and one of <math>\arccos(-\frac{1}{12}+\frac{19}{60}\sqrt{5})\approx 51.335\,802\,942\,83^{\circ}</math>. Its dihedral angles equal <math>\arccos({\frac{-44+3\sqrt{5}}{61}})\approx 127.686\,523\,427\,48^{\circ}</math>. The ratio between the lengths of the long edges and the short ones equals <math>\frac{31+5\sqrt{5}}{22}\approx 1.917\,288\,176\,70</math>.
References
- Шаблон:Citation p. 62
External links
