A polyhedron.
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It has one flat face if its 2 dimensional. It has 6 flat faces if it is 3 dimensional.
tetrahedron 4, hexahedron (cube) 6, octohedron (diamond) 8, dodecahedron 12 and icosahedron 20.
You know how 2-dimensional shapes are flat right? Well 3-dimensional means that it can go to and from you also.
They are closed 3-dimensional shapes with polygonal faces.
They are both 3 dimensional shapes with faces that are polygons.