In geometry, the decagrammic antiprism is one in an infinite set of nonconvex antiprisms formed by triangle sides and two regular star polygon caps, in...

In geometry, an n-gonal antiprism or n-antiprism is a polyhedron composed of two parallel direct copies (not mirror images) of an n-sided polygon, connected...

Enneagrammic antiprism (9/4) Enneagrammic crossed-antiprism, Enneagrammic prism (9/2), Enneagrammic prism (9/4) Decagrammic prism, Decagrammic antiprism Johnson...

digonal antiprism). The only nonconvex uniform 4-dimensional antiprism analogue uses pentagrammic crossed-antiprisms instead of pentagonal antiprisms, and...

decagonal prisms Compound of six decagrammic prisms Compound of six pentagonal prisms Compound of six pentagrammic crossed antiprisms Compound of six pentagrammic...

resulting figure is generally not uniform except for two cases: the grand antiprism and its conjugate, the pentagrammic double antiprismoid (with p = 5 and...

uniform star polyhedra including two infinite series, of prisms and of antiprisms, and their duals. The uniform and dual uniform star polyhedra are also...

prisms alternate into pentagonal antiprisms, the decagrammic prisms alternate into pentagrammic crossed-antiprisms with new regular tetrahedra created...

{p/q}-gonal antiprisms (UC22, UC23, UC24 and UC25) exist only when ⁠p/q⁠ > ⁠3/2⁠, and when p and q are coprime. Furthermore, when ⁠p/q⁠ = 2, the antiprisms degenerate...

with the icosahedron: the pentagonal antiprism is a parabidiminished icosahedron and a pentagrammic crossed-antiprism is a parabidiminished great icosahedron...