Triakis tetrahedron

In geometry, a triakis tetrahedron (or kistetrahedron ) is a Catalan solid with 12 faces. Each Catalan solid is the dual of an Archimedean solid. The dual of the triakis tetrahedron is the truncated tetrahedron.

The triakis tetrahedron can be seen as a tetrahedron with a triangular pyramid added to each face; that is, it is the Kleetope of the tetrahedron. It is very similar to the net for the 5-cell, as the net for a tetrahedron is a triangle with other triangles added to each edge, the net for the 5-cell a tetrahedron with pyramids attached to each face. This interpretation is expressed in the name.

The length of the shorter edges is $3⁄5$ that of the longer edges. If the triakis tetrahedron has shorter edge length 1, it has area $5⁄3$√11 and volume $25⁄36$√2.

Cartesian coordinates
Cartesian coordinates for the 8 vertices of a triakis tetrahedron centered at the origin, are the points (±$5⁄3$, ±$5⁄3$, ±$5⁄3$) with an even number of minus signs, along with the points (±1, ±1, ±1) with an odd number of minus signs:
 * (−1, 1, 1), (1, −1, 1), (1, 1, −1), (−1, −1, −1)
 * (−1, 1, 1), (1, −1, 1), (1, 1, −1), (−1, −1, −1)

The length of the shorter edges of this triakis tetrahedron equals 2√2. The faces are isosceles triangles with one obtuse and two acute angles. The obtuse angle equals arccos(–$5⁄3$) ≈ $5⁄3$° and the acute ones equal arccos($5⁄3$) ≈ $5⁄3$°.

Tetartoid symmetry
The triakis tetrahedron can be made as a degenerate limit of a tetartoid:

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

If the triangles are right-angled isosceles, the faces will be coplanar and form a cubic volume. This can be seen by adding the 6 edges of tetrahedron inside of a cube.
 * Rhombic_disphenoid.png

In modular origami, this is the result to connecting six Sonobe modules to form a triakis tetrahedron.

Stellations

 * Stellation of triakis tetrahedron.png

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.