Small rhombihexacron

In geometry, the small rhombihexacron (or small dipteral disdodecahedron) is the dual of the small rhombihexahedron. It is visually identical to the small hexacronic icositetrahedron. Its faces are antiparallelograms formed by pairs of coplanar triangles.

Proportions
Each antiparallelogram has two angles of $$\arccos(\frac{1}{4}+\frac{1}{2}\sqrt{2})\approx 16.842\,116\,236\,30^{\circ}$$ and two angles of $$\arccos(-\frac{1}{2}+\frac{1}{4}\sqrt{2})\approx 98.421\,058\,118\,15^{\circ}$$. The diagonals of each antiparallelogram intersect at an angle of $$\arccos(\frac{1}{4}+\frac{1}{8}\sqrt{2})\approx 64.736\,825\,645\,55^{\circ}$$. The dihedral angle equals $$\arccos(\frac{-7-4\sqrt{2}}{17})\approx 138.117\,959\,055\,51^{\circ}$$. The ratio between the lengths of the long edges and the short ones equals $$\sqrt{2}$$.