cube is 3d.
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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.
Well, a 2D object has only length and width, but a 3D object has length, width, and depth.
Paper is a 3D object.
A sphere.
A Heptagon is a 3d object with 7 faces. An example of a heptagon is a hexagonal pyramid (that is a pyramid with a hexagon for the base).