The 3 / 2-crossed antiprism ( trirp ) is degenerate, being flat in Euclidean space, and is also marked with a large cross.
32.
Zirconium, hafnium, plus many of the actinides form tetrafluorides with an ionic structure that puts the metal cation in an 8-coordinate square antiprism.
33.
It is the simplest of the trapezohedra, an infinite sequence of polyhedra which are dual of a " trigonal trapezohedron " is a triangular antiprism.
34.
Extra regularity is obtained when the line connecting the base centers is perpendicular to the base planes, making it a "'right antiprism " '.
35.
In the case of the dual of a " triangular antiprism " the kites are rhombi ( or squares ), hence these trapezohedra are also zonohedra.
36.
The snub square antiprism ( " J " 85 ) can be seen as a square antiprism with a chain of equilateral triangles inserted around the middle.
37.
The snub square antiprism ( " J " 85 ) can be seen as a square antiprism with a chain of equilateral triangles inserted around the middle.
38.
Extra regularity is obtained by the line connecting the base centers being perpendicular to the base planes, making it a "'right antiprism " '.
39.
This decomposition of the 600-cell has symmetry [ [ 10, 2 +, 10 ] ], order 400, the same symmetry as the grand antiprism.
40.
As the name suggests, it can be constructed by gyroelongating a square cupola ( " J " 4 ) by attaching an octagonal antiprism to its base.
