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A rectangle is a 2-dimensional shape. Its equivalent in 3-dimensions is a cuboid. The equivalent of a cuboid in 4 or more spatial dimensions is a hyper-cuboid.
If the dimensions of the cuboid are also in cm then (16*4*8)/(2*2*2) = 64 cubes
A cuboid has 8 corners.
A cuboid has 6 faces.
A cuboid has 8 vertices.