Decagrammic antiprism

{{Short description|Polyhedron with 22 faces}}

{{Infobox polyhedron

|image=Antiprism 10-3.png

|type=Uniform polyhedron

|faces=2 Decagrams
20 triangles

|edges=40

|vertices=20

|wythoff=-2 2 {{frac|10|3}}

|symmetry=D_10d, [2⁺,20], (2*10), order 40

|vertex_config={{frac|10|3}}.3.3.3

|dual=Decagrammic deltohedron

|properties=nonconvex

|vertex_figure=Decagrammic antiprism-3-10 vertfig.png

}}

File:Decagrammic antiprism.stl

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 this case two decagrams.