The triangular (or trigonal) dipyramid is one of the convex deltahedra, and Johnson solid J_(12 ... Two Ways of Folding a Sphinx into a Triangular Dipyramid ...
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mathworld.wolfram.com/TriangularDipyramid.html
mathworld.wolfram.com/TriangularDipyramid.html
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Bipyramid - Wikipedia, the free encyclopedia
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An n -gonal bipyramid or dipyramid is a polyhedron formed by joining an n -gonal pyramid and its mirror image base-to-base. The referenced n -gon in the name of the bipyramids is not an exte...
en.wikipedia.org/wiki/Bipyramid
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Pentagonal dipyramid - Wikipedia, the free encyclopedia
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In geometry, the pentagonal dipyramid (or bipyramid) is third of the infinite set of face-transitive dipyramids. The set of dipyramids is the dual of the uniform prisms. It is also a Johnson solid (...
en.wikipedia.org/wiki/Pentagonal_dipyramid
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Triangular dipyramid - Wikipedia, the free encyclopedia
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In geometry, the triangular dipyramid (or bipyramid) is the first in the infinite set of face-transitive dipyramids. It is the dual of the triangular prism with 6 isosceles triangle faces. It is als...
en.wikipedia.org/wiki/Triangular_dipyramid
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Joining two such pyramids at their bases gives a set of three dipyramids, in which all faces are equilateral triangles: the triangular dipyramid, the octahedron (square dipyramid), and the pentagonal dipyramid.
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www.georgehart.com/virtual-polyhedra/pyramids-info.html
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Triangular Dipyramid: Number of faces: 6; Number of edges: 9; Number of vertices: 5 ... Paper Models of Polyhedra ... Home > Dipyramids> Dipyramids < < previous...
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www.korthalsaltes.com/model.php?name_en=dipyramids
www.korthalsaltes.com/model.php?name_en=dipyramids
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The pentagonal dipyramid is one of the convex Deltahedra, and Johnson Solid . It is also the Dual Polyhedron of the Pentagonal Prism. The distance between two adjacent Vertices on the base of the Pentagon is ;
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www.math.sdu.edu.cn/mathency/math/p/p199.htm
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One of the eight convex Deltahedra. It consists of two oppositely faced Square Pyramids rotated 45° to each other and separated by a ribbon of eight side-to-side Triangles. It is Johnson Solid . ... Call the coordinates of the upper Pyramid bases (± 1, ± 1, ) and of the lower ( , 0, ) ... Now consider the points (1, 1,
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www.math.sdu.edu.cn/mathency/math/g/g387.htm
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