For example if I need to find the volume of an L shaped box there are more than three sides to measure. The volume of a cube can be calculated if you know its side length. Measuring the side of the cube is easy.
This is when all the sides are the same length.
CBM calculation is very simple to calculate. Your calculation would be as follows. You can find the volume of a cube by just knowing the measurement of one side. If a cube has side length a then.