bgcolor=#e7dcc3 colspan=2 | Pseudo-deltoidal icositetrahedron | |||
---|---|---|---|---|
align=center colspan=2 | (see model) | |||
Type | Johnson dual, pseudo-uniform dual | |||
Faces | , congruent | |||
Face polygon | Kite with: obtuse angle equal acute angles | |||
Edges | short + long = | |||
Vertices | of degree of degree in all | |||
Vertex configurations | (for vertices) (for vertices) | |||
Symmetry group | order | |||
Rotation group | order | |||
Dihedral angle | same value for short & long edges: \arccos\left(-
≈ 138\circ07'05'' | |||
Properties | convex, regular vertices | |||
Net | ||||
Dual polyhedron |
The pseudo-deltoidal icositetrahedron is a convex polyhedron with congruent kites as its faces. It is the dual of the elongated square gyrobicupola, also known as the pseudorhombicuboctahedron.
As the pseudorhombicuboctahedron is tightly related to the rhombicuboctahedron, but has a twist along an equatorial belt of faces (and edges), the pseudo-deltoidal icositetrahedron is tightly related to the deltoidal icositetrahedron, but has a twist along an equator of (vertices and) edges.
As the faces of the pseudorhombicuboctahedron are regular, the vertices of the pseudo-deltoidal icositetrahedron are regular.[1] But due to the twist, these vertices are of four different kinds:
A pseudo-deltoidal icositetrahedron has 48 edges: 24 short and 24 long, in the ratio of
1:2-\tfrac{1}{\sqrt{2}}
\tfrac{2}{7}\sqrt{10-\sqrt{2}}
\sqrt{4-2\sqrt{2}}
As the pseudorhombicuboctahedron has only one type of vertex figure, the pseudo-deltoidal icositetrahedron has only one shape of face (it is monohedral); its faces are congruent kites. But due to the twist, the pseudorhombicuboctahedron is not vertex-transitive, with its vertices in two different symmetry orbits (*), and the pseudo-deltoidal icositetrahedron is not face-transitive, with its faces in two different symmetry orbits (*) (it is -isohedral); these faces are of two different kinds:
(*) (three different symmetry orbits if we only consider rotational symmetries)