Tetrahedron (4 triangles, like a pyramid design with a triangular base)
Cube
Octahedron (8 triangles - like two pyramids stuck together at the base, one going up and one going down)
Icosahedron (20 triangles)
Dodecahedron (12 pentagons)
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5 tetrahedron, cube, octahedron, dodecahedron, and Icosahedron
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
Yes, an empty box is and No, polyhedrons don't have to be.
not all
Cone, cylinder.