# Paper Twisted Pyramid

## Twisted Pyramid:

Number of faces: 13

Number of edges: 20

Number of vertices: 9

Twisted Pyramid nets (templates) for making the shape

twisted pyramid (.PDF)

Print the PDF file to make the paper model.

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.