It is a cuboid
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3-dimensional is not flat, like a cardboard box, while 2-dimensional shape is flat, like a face of a 3-D shape.e.g, a face of a box.
The side and face of a 3-D shape are the same thing, but the side of a 3-D object is not, itself 3-Dimensional.
The net of a 2 dimensional shape can be folded into a 3 dimensional shape
a cylinder
A cube is a 3 dimensional shape