length x width x height
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It is the sum of its sides
Perimeter is not normally a concept associated with 3-dimensional objects. The volume of a cube, with sides of x units is x3 cubic units.
The Perimeter
A perimeter is normally defined for 2-dimensional shapes and not three dimensional ones. A cube has 12 edges. So, if the perimeter is 48 cm, each edge must be 48/12 = 4 cm. The cross section of a cube depends on the angle of the plane intersecting the cube and, if it is not perpendicular to the cube, can be triangular, parallelogram or hexagonal. Assuming the plane is at right angles to the cube, the cross section is a square with sides of 4 cm. So its area is 16 cm2
Compute = calculate; perimeter = measurement of the outside edge.