# Three-parameter model transformations of the Tetrahedron. Extreme distributions.

- Author:
- Roman Chijner

Three parameters are used to transform Tetrahedron faces:
t - for truncating,
q-similarity transformations,
α-angle rotation of faces.
With these parameters, using the well-known Expansion and Snub operations applied to a polyhedron, you can explore various polyhedra and get a number of Archimedean Solids.
The p (distance sum) is defined here as the ratio of the sum of all pairwise distances between the vertices of the polyhedron to the number of these pairs and the radius of circumscribed sphere. Value p can be given the meaning of the

*mean distance between the vertices of a polyhedron on a unit sphere*. There are three parameters that are used for**two**maximizations of the*average distance*between vertexes. Difference: in the first case, the angle rotation of faces is fixed(α=0). The buttons should be pressed (iterations) until precision-the difference between the two subsequent values is 10^{-15}.__Case 5__corresponds to the first maximization,__Case 6__**-**to the second. Iterations are very slow on-line. It is preferable to carry out them off-line for the desktop version.__Case 5__is an extreme distribution: Δφ_{GM}=0x10^{0 }rad, but__Case 6__, as can be seen from the table, is not: Δφ_{GM}=2.78x10^{-3 }rad.## Values of parameters in the polyhedron model defining the well-known polyhedra.

## Example 5. Pmax=1.383 075 228 171 583, t, q, α=0 rad, V=24.

_{GM}=5.27*10

^{-9}rad).

## Example 6. t, q, α≠0- Pmax= 1.383 117 342 322 636, V=24

_{GM}=2.78*10

^{-3 }rad).