I think they all have 1.... because 2d shapes are flat!!! :)
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I always thought that a 2D shape has two faces, front and back, could you please tell me if I am wrong, or is it all a matter of perspective?
A 2D shape does have one face.
a 2d shape can only ever contain 1 face!
Since the square is a 2D shape, it only has one face.
One
A rhombus is a 2D shape.