a sphere
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A cylinder would fit the given description.
cylinder
If the faces are flat, it's a line.
A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.