Re: [math-fun] Tetranacci Tetrahedron

Not sure that I've understood this --- is it a statement about the symmetry group of some isohedral tiling of the plane? WFL On 12/18/19, ed pegg <ed@mathpuzzle.com> wrote:

Let t^2 =1.92756 be the tetranacci constant. Build a tetrahedron with edgelengths t^0 opposite t^3 t^1 opposite t^1 t^2 opposite t^2

This has 4 similar triangles of 2 sizes.

If this tetrahedron is rolled on its edges, it only reaches 12 different orientations. -Ed Pegg Jr

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