The following are some examples of a shape with two flat face and one curved surface:
A sphere intersected by two planes.
An ellipsoid intersected by two plane faces.
A paraboloid intersected by two plane faces.
A cone intersected by two plane faces.
A cylinder.
A hyperboloid intersected by two plane faces.
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a cuboid
It fits the description of a cylinder
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
A cylinder
I think they all have 1.... because 2d shapes are flat!!! :)