Bifrustum
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| Set of bifrustums or Truncated bipyramids |
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| Faces | 2 n-gons, 2n trapezoids |
| Edges | 5n |
| Vertices | 3n |
| Symmetry group | Dnh |
| Dual polyhedron | Elongated bipyramids |
| Properties | convex |
An n-agonal bifrustum (or truncated bipyramid) 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 frusta combined across a plane of symmetry, and also as a bipyramid with the two polar vertices truncated.
They are duals to the family of elongated bipyramids.
[edit] Forms
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| 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 |
In general, a n-agonal bifrustum has 2n trapezoids, 2 n-agons, and is dual to the elongated dipyramids.
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