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a 3D shape has 3 dimensions; length, with and depth
A 3D shape must have length x width x depth.
Adding depth makes a 3D object from a 2D shape.
A cut diamond is a 3D object as it has length, width and depth (even if it is roundish like a pebble)
A sheet of A4 paper could be classed as a plane 2D shape, as it has length x width. A shoebox is an example of a 3D shape, as it has length x width x depth.