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.
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It's a 2D shape.
a pyramid is a 3D shape :)
Paper is a 3D object.
A 2d shape is a flat object (ex: square, circle, etc.) and a 3d shape is a shape in space (ex: cube, sphere, etc.)
3D