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A '''tetrahedron''' is a [[Pyramid|pyramidal]] [[Polyhedron|polyhedral]] structure in which a [[Triangle|triangular]] base is surmounted by three triangular sides which meet at a common apex. In a ''regular tetrahedron'', all 4 of the triangular faces are equilateral. A regular tetrahedron is one of the five [[Platonic]] Solids, and the one with the smallest number of faces and smallest number of vertices.
A '''tetrahedron''' is a [[pyramid]]al [[Polyhedron|polyhedral]] structure in which a [[Triangle|triangular]] base is surmounted by three triangular sides which meet at a common apex. In a ''regular tetrahedron'', all 4 of the triangular faces are equilateral. A regular tetrahedron is one of the five [[Platonic]] Solids, and the one with the smallest number of faces and smallest number of vertices.
==Geometry==
==Geometry==