The flat side so the solid that lays flat without moving.
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You probably mean the Platonic Solids, they are the only five shapes constructed from the same faces.
prisms
it means the shapes that has faces,vertices and edges
The only regular 3D shapes I can think of with 5 faces are the square-based pyramid and the triangular prism (which is shaped like a Toblerone bar).
Spheres have no faces.