Bifrustum

Bifrustum

An "n"-agonal bifrustum is a polyhedron composed of three parallel planes of "n"-agons, with the middle plane largest and usually the top and bottom congruent.

It can be constructed as two congruent frustum combined across a plane of symmetry, and also as a bipyramid with the two polar vertices truncated.

Forms

* Triangular bifrustum - 6 trapezoids, 2 triangles, dual elongated triangular dipyramid
* Square bifrustum - 8 trapezoids, 2 squares, dual elongated square dipyramid
* Pentagonal bifrustum - 10 trapezoids, 2 pentagons, dual elongated pentagonal dipyramid
* Hexagonal bifrustum - 12 trapezoids, 2 hexagons, dual elongated hexagonal dipyramid
* ...
* n-agonal bifrustum - 2n trapezoids, 2 n-agons, duals elongated dipyramid


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  • Hexagonal bifrustum — The hexagonal bifrustum or truncated bipyramid is the fourth in an infinite series of bifrustum polyhedra. It has 12 trapezoid and 2 hexagonal faces.This polyhedron can be constructed by taking a hexagonal dipyramid and truncating the polar axis… …   Wikipedia

  • Pentagonal bifrustum — The Pentagonal bifrustum or pentagonal truncated bipyramid is the third in an infinite series of bifrustum polyhedra. It has 10 trapezoid and 2 pentagonal faces.This polyhedron can be constructed by taking a pentagonal dipyramid and truncating… …   Wikipedia

  • Square bifrustum — The square bifrustum or square truncated bipyramid is the second in an infinite series of bifrustum polyhedra. It has 4 trapezoid and 2 square faces.This polyhedron can be constructed by taking a square dipyramid and truncating the polar axis… …   Wikipedia

  • Triangular bifrustum — The triangular bifrustum or triangular truncated bipyramid is the second in an infinite series of bifrustum polyhedra. It has 6 trapezoid and 2 triangle faces.This polyhedron can be constructed by taking a triangular dipyramid and truncating the… …   Wikipedia

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  • Elongated triangular dipyramid — Infobox Polyhedron Polyhedron Type=Johnson J 13 J14 J15 Face List=6 triangles 3 squares Edge Count=15 Vertex Count=8 Symmetry Group= D 3h Vertex List=2(33) 6(32.42) Dual=Triangular bifrustum Property List=convexIn geometry, the elongated… …   Wikipedia

  • Elongated square dipyramid — Infobox Polyhedron Polyhedron Type=Johnson J14 J15 J16 Face List=8 triangles 4 squares Edge Count=20 Vertex Count=10 Symmetry Group= D 4h Vertex List=2(34) 8(32.42) Dual=Square bifrustum Property List=convexIn geometry, the elongated square… …   Wikipedia

  • Elongated pentagonal dipyramid — Infobox Polyhedron Polyhedron Type=Johnson J15 J16 J17 Face List=10 triangles 5 squares Edge Count=25 Vertex Count=12 Symmetry Group= D 5h Vertex List=10(32.42) 2(35) Dual=Pentagonal bifrustum Property List=convexIn geometry, the elongated… …   Wikipedia

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