In Plato's theory (hence the 'Platonic' solids)
Earth is associated with the cube, as it was strong and sank to the ground.
Water is associated with the icosahedron, as it could move easily.
Air is associated with the octahedron, as it could both penetrate and be mobile.
Fire is associated with the tetrahedron, as it penetrated but did not flow.
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No, a cone is not a Platonic solid. The Platonic solids are the five regular polyhedra: tetrahedron, cube, octahedron, dodecahedron, and icosahedron.
The faces of Platonic solids are regular polygons...
No; platonic solids are tetrahedron, cube, octahedron, dodecahedron, icosahedron.
A Platonic solid?
A tetrahedron.