Tetrahedron
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A tetrahedron is a pyramidal polygon structure in which the base is surmounted by three triangular sides which meet at a common apex.
Geometry
The volume of a triangular-based pyramid:
V is the overall volume of a pyramid. B equals the area of the base, and h is the perpendicular height.[1][2][3]
Trinitarian analogy
The tetrahedron can be used to illustrate the unity of the Trinity.