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A regular tetrahedron is a three-dimensional shape composed of four identical equilateral triangles and four vertices. It is classified as a regular triangular pyramid. Interestingly, the distance between any two vertices of a regular tetrahedron is the same, unlike other Platonic solids. According to Plato, the tetrahedron symbolizes fire. **Mathematical formulas**: Volume of a tetrahedron: V = (a³ ∙ √2) ∕ 12 Surface area of a tetrahedron: A = a² ∙ √3
