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revised polygon to polyhedral
A '''tetrahedron''' is a [[Pyramid|pyramidal]] [[polygon]] structure in which a triangular base is surmounted by three triangular sides which meet at a common apex.
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.
==Geometry==
==Geometry==