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# Paper Star Dipyramids

## Pentagonal Star Dipyramid: Number of faces: 20 Number of edges: 30 Number of vertices: 12 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.
 Visual instructions aluminium foil on paper model (example: pedestal) 1. Cut the model out and fold.2. Unfold  3. Glue a large sheet of aluminium foil on the the model.4. Cut the aluminium foil around the model  5. Cut the aluminium foil close to the model and fold around the paper.6. Glue the model  