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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.
If drawn on a flat plane (paper, for instance), then yes, they are a 2D shape.
A '2d' ( 2-dimensional) shapoe is a straight line, or a polygon.
A 2d shape is a flat object (ex: square, circle, etc.) and a 3d shape is a shape in space (ex: cube, sphere, etc.)
Yes. Any shape drawn (or printed) on a plane surface is a 2-d shape.