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Tetrahedron

One of the five regular convex polyhedra known as the Platonic solids. This model was made from a single connected net, printed on one sheet of A4 paper. Nets can be generated and printed at any size using any of Small Stella, Great Stella, or Stella4D, even in the free demo versions.

Here's a tetrahedron in Stella, using a 3-view layout featuring the tetrahedron itself, the unfolded net, and a partially folded net. See more screenshots here.
Multiple tetrahedra can be arranged in an intersecting manner to form various compounds. The simplest and best known is the Stella Octangula, consisting of 2 intersecting tetrahedra. This can be seen as a compound of a tetrahedron with its dual, which happens to be another tetrahedron. It is also a faceting of the cube and a stellation of the octahedron.
Here's another compound, consisting of 4 intersecting tetrahedra.
This compound consists of 5 intersecting tetrahedra. Since it has rotational symmetry but no reflective symmetry, it comes in left and right forms. It is a faceting of the dodecahedron and a stellation of the icosahedron.
This compound contains 10 intersecting tetrahedra, and is a combination of the two 5-tetrahedron compounds above. It is also a faceting of the dodecahedron and a stellation of the icosahedron.

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