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Hace 21 horas · 3D model of a regular tetrahedron. In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices.The tetrahedron is the simplest of all the ordinary convex polyhedra.. The tetrahedron is the three-dimensional case of the more general concept of a Euclidean simplex, and ...
