Tetrahedron
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A polyhedron can have any number of faces 4 or higher.
A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
A Prismthe faces are called bases
4
A polyhedron with 20 faces is called an icosahedron.