Because a tetrahedron is a triangular based pyramid that has 4 identical faces and 4 faces meet at all the vertices.
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Platonic solid basically means that the surfaces are all of the same shape, all regular polygons, and that all the angles are the same.
A tetrahedron.
No, a cone is not a Platonic solid. The Platonic solids are the five regular polyhedra: tetrahedron, cube, octahedron, dodecahedron, and icosahedron.
No; platonic solids are tetrahedron, cube, octahedron, dodecahedron, icosahedron.
Yes. The five platonic solids are the only regular three dimensional shapes: Cube, Tetrahedron, Octahedron, Icosahedron, and Dodecahedron
no