Either a net or a face - it depends on what your question means.
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A shape
rectangle
none!all shapes are flat
A square is a 2 dimensional shape with one flat surface area whereas a cube is a 3 dimensional shape with six flat surface areas.
There can be no such shape. If there were a shape with n flat surfaces, then if you sliced off one vertex, you would have a shape with n+1 flat surfaces. So it is always possible to add one more flat surface.