It has the same vertex arrangement as the pentagonal antiprism .
The pentagrammic crossed - antiprism may be inscribed within an icosahedron , and has ten triangular faces in common with the great icosahedron .
crossed - antiprism has the same vertex arrangement as the pentagonal antiprism .
The pentagrammic crossed - antiprism may be inscribed within an icosahedron , and has ten triangular faces in common with the great icosahedron .