Great rhombidodecacron explained

In geometry, the great rhombidodecacron (or Great dipteral ditriacontahedron) is a nonconvex isohedral polyhedron. It is the dual of the great rhombidodecahedron. It is visually identical to the great deltoidal hexecontahedron. Its faces are antiparallelograms.

Proportions

Each antiparallelogram has two angles of

\arccos(	1	+
	2

	1
	5

\sqrt{5}) ≈ 18.69940708515^\circ

and two angles of

\arccos(-	5	+
	8

	1
	8

\sqrt{5}) ≈ 110.21180180589^\circ

. The diagonals of each antiparallelogram intersect at an angle of

\arccos(	1	+
	8

	9\sqrt{5

})\approx 51.088\,791\,108\,96^. The dihedral angle equals

\arccos(	-19+8\sqrt{5

})\approx 91.553\,403\,672\,16^. The ratio between the lengths of the long edges and the short ones equals

	1	+
	2

	1
	2

\sqrt{5}

, which is the golden ratio. Part of each face lies inside the solid, hence is invisible in solid models.