Reference Tetrahedron

Some articles on tetrahedron, reference tetrahedron:

Properties of A General Tetrahedron
... The tetrahedron has many properties analogous to those of a triangle, including an insphere, circumsphere, medial tetrahedron, and exspheres ... The circumsphere of the medial tetrahedron is analogous to the triangle's nine-point circle, but does not generally pass through the base points of the altitudes of the reference tetrahedron ... Gaspard Monge found a center that exists in every tetrahedron, now known as the Monge point the point where the six midplanes of a tetrahedron intersect ...

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    Ultimately Warhol’s private moral reference was to the supreme kitsch of the Catholic church.
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