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{{Semireg dual polyhedra db|Semireg dual polyhedron stat table|dtT}}
In [[geometry]], a '''triakis tetrahedron''' is an [[Archimedean solid|Archimedean dual]] solid, or a [[Catalan solid]]. Its dual is the [[truncated tetrahedron]].
 
It can be seen as a [[tetrahedron]] with [[triangular pyramid]]s added to each face; that is, it is the [[Kleetope]] of the tetrahedron. This interpretation is expressed in the name.
 
If the triakis tetrahedron has shorter edge lengths 1, it has area <math>\tfrac{5}{3} \scriptstyle{\sqrt{11}}</math> and volume <math>\tfrac{25}{36} \scriptstyle{\sqrt{2}}</math>.
 
== Orthogonal projections ==
{| class=wikitable
|+ [[Orthogonal projection]]
!Centered by
!Edge normal
!Face normal
!Edge
!Face/vertex
|- align=center
!Truncated<BR>[[tetrahedron]]
|[[File:tetrahedron t01 ae.png|100px]]
|[[File:tetrahedron t01 af36.png|100px]]
|[[File:3-simplex t01.svg|100px]]
|[[File:3-simplex t01 A2.svg|100px]]
|- align=center
!Triakis<BR>tetrahedron
|[[File:Dual tetrahedron t01 ae.png|100px]]
|[[File:Dual tetrahedron t01 af36.png|100px]]
|[[File:Dual tetrahedron t01.png|100px]]
|[[File:Dual tetrahedron t01 A2.png|100px]]
|- align=center
|- align=center
!Projective<BR>symmetry
![1]
![1]
![3]
![4]
|}
 
==Variations==
A triakis tetrahedron with equilateral triangle faces represents a [[polyhedral net|net]] of the four-dimensional regular polytope known as the [[5-cell]].
 
==Stellations==
:[[File:Stellation of triakis tetrahedron.png|160px]]
This chiral figure is one of thirteen [[stellation]]s allowed by [[The Fifty-Nine Icosahedra#Miller's rules|Miller's rules]].
 
== Related polyhedra ==
The triakis tetrahedron is a part of a sequence of polyhedra and tilings, extending into the hyperbolic plane. These [[face-transitive]] figures have (*n32) reflectional [[Orbifold notation|symmetry]].
 
{{Truncated figure1 table}}
 
{{Tetrahedron family}}
 
==See also==
*[[Truncated triakis tetrahedron]]
 
==References==
*{{The Geometrical Foundation of Natural Structure (book)}} (Section 3-9)
*{{Citation |last1=Wenninger |first1=Magnus |author1-link=Magnus Wenninger |title=Dual Models |publisher=[[Cambridge University Press]] |isbn=978-0-521-54325-5 |id={{MathSciNet |id=730208}} |year=1983}} (The thirteen semiregular convex polyhedra and their duals, Page 14, Triakistetrahedron)
*''The Symmetries of Things'' 2008, John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, ISBN 978-1-56881-220-5 [http://www.akpeters.com/product.asp?ProdCode=2205] (Chapter 21, Naming the Archimedean and Catalan polyhedra and tilings, page 284, Triakis tetrahedron )
 
==External links==
*{{Mathworld2 |urlname=TriakisTetrahedron |title=Triakis tetrahedron |urlname2=CatalanSolid |title2=Catalan solid}}
 
{{Polyhedron navigator}}
 
[[Category:Catalan solids]]
 
 
{{Polyhedron-stub}}

Revision as of 17:45, 4 January 2014

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Also visit my site - como ganhar dinheiro na internet In geometry, a triakis tetrahedron is an Archimedean dual solid, or a Catalan solid. Its dual is the truncated tetrahedron.

It can be seen as a tetrahedron with triangular pyramids added to each face; that is, it is the Kleetope of the tetrahedron. This interpretation is expressed in the name.

If the triakis tetrahedron has shorter edge lengths 1, it has area and volume .

Orthogonal projections

Orthogonal projection
Centered by Edge normal Face normal Edge Face/vertex
Truncated
tetrahedron
Triakis
tetrahedron
Projective
symmetry
[1] [1] [3] [4]

Variations

A triakis tetrahedron with equilateral triangle faces represents a net of the four-dimensional regular polytope known as the 5-cell.

Stellations

This chiral figure is one of thirteen stellations allowed by Miller's rules.

Related polyhedra

The triakis tetrahedron is a part of a sequence of polyhedra and tilings, extending into the hyperbolic plane. These face-transitive figures have (*n32) reflectional symmetry.

Template:Truncated figure1 table

Template:Tetrahedron family

See also

References

  • Template:The Geometrical Foundation of Natural Structure (book) (Section 3-9)
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External links

Template:Polyhedron navigator


Template:Polyhedron-stub