None.
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You could classify a regular tetrahedron, which is a platonic sold, as a cone.
WHat is the difference between polyheron and platonic solid
A trapezoid is not a platonic solid. There are only five platonic solids. They are the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron.
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A pyramid has the solid quadrilateral pyramid solid shape.However there are also pyramids with geometrical polyhedra/platonic solid shapes of tetrahedron.