Tetrahedron

thingiverse

The Tetrahedron is a polyhedron consisting of four triangular faces, six straight edges and four vertexes at the corner of each edge. Each angle of a Tetrahedron measures around 60 degrees making it nearly impossible for you to construct such an exact figure without precise measuring tools because each side will inevitably measure in close but never precisely accurate measurements unless made possible by mathematical calculations which give the illusion of precision through accuracy.