It has one because the round surface does not count.
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Cylinder and cone are different because:Cylinder doesn't have the sharp point at the end as cone has.Cylinder has two circular bases while cone only has one.
A cone has a curved surface and only has one base (the bottom). A prism however, has two bases (the top and bottom) and has only polygonal faces. A cone also has an apex which a prism doesn't.
For example, a sphere or an ellipsoid.
There is one face in a cone. It is at the bottom.
2 sides, the base and the cone.