Paper Star Dipyramids
Pentagrammic Dipyramid On Pedestal:
Pentagrammic Dipyramid:
Number of faces: 10
Number of edges: 15
Number of vertices: 7
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)
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1. Cut the model out and fold. 2. Unfold
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3. Glue a large sheet of aluminium foil on the the model. 4. Cut the aluminium foil around the model
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5. Cut the aluminium foil close to the model and fold around the paper. 6. Glue the model
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