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.
Set of bifrusta | |
---|---|
![]() Example hexagonal bifrustum | |
Faces | 2 n-gons, 2n trapezoids |
Edges | 5n |
Vertices | 3n |
Symmetry group | Dnh, [n,2], (*n22) |
Dual polyhedron | Elongated bipyramids |
Properties | convex |
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.
Forms
Three bifrustums are duals to three Johnson solids, J14-16. In general, a n-agonal bifrustum has 2n trapezoids, 2 n-agons, and is dual to the elongated dipyramids.
Triangular bifrustum | Square bifrustum | Pentagonal bifrustum |
---|---|---|
![]() |
![]() |
![]() |
6 trapezoids, 2 triangles. Dual to elongated triangular bipyramid, J14 | 8 trapezoids, 2 squares. Dual to elongated square bipyramid, J15 | 10 trapezoids, 2 pentagons. Dual to elongated pentagonal bipyramid, J16 |
gollark: I have other pictures of the automelon machines and stuff.
gollark: Er, I think a month or two at this point.
gollark: It's me, <@160279332454006795>, and some other people.
gollark: The autocrafting system of the Unicode Consortium on there can actually do roughly the same things, because it contains similar AE2 hardware and has a lot of machines hooked up, but this has the potatOS installation machine and is faster through having dedicated machines for things.
gollark: It makes computers *with no external inputs*, and also makes OC computers, you see.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.