# Paper Truncated Star Pyramids

## Truncated Pentagrammic Pyramid (low):

Number of faces: 7

Number of edges: 15

Number of vertices: 10

## Truncated Hexagrammic Pyramid:

Number of faces: 8

Number of edges: 18

Number of vertices: 12

## Truncated Tetragonal Star:

Number of faces: 10

Number of edges: 24

Number of vertices: 16

## Truncated Pentagonal Star Pyramid:

Number of faces: 12

Number of edges: 30

Number of vertices: 20

## Truncated Pentagonal Star Pyramid (irragular):

Number of faces: 12

Number of edges: 30

Number of vertices: 20

## Truncated Hexagonal Star Pyramid:

Number of faces: 14

Number of edges: 36

Number of vertices: 24

## Truncated Octagonal Star Pyramid:

Number of faces: 18

Number of edges: 48

Number of vertices: 32

Definition of a Pyramid: A pyramid is a polyhedron with one face (known as the "base") a polygon and all the other faces triangles meeting at a common polygon vertex (known as the "apex"). A right pyramid is a pyramid for which the line joining the centroid of the base and the apex is perpendicular to the base. A regular pyramid is a right pyramid whose base is a regular polygon. An n-gonal regular pyramid (denoted Yn) having equilateral triangles as sides is possible only for n=3, 4, 5. These correspond to the tetrahedron, square pyramid, and pentagonal pyramid, respectively.