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A '''tetrahedron''' is a [[Pyramid|pyramidal]] [[Polyhedron|polyhedral]] structure in which a triangular base is surmounted by three triangular sides which meet at a common apex. Of the five regular convex polyhedra known as the [[Platonic]] Solids, the tetrahedron has the fewest possible number of sides.
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. Of the five regular convex polyhedra known as the [[Platonic]] Solids, the tetrahedron has the fewest possible number of sides.
==Geometry==
==Geometry==