Length times Width times Height. Archimedes used a "bathtub", and submerged the object to see what volume of water was displaced.
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To find the volume of an object, we use an overflow cylinder as it gives a measure of the volume of the object by displacing an equal amount of water into the beaker.
The answer depends on what information you do have about the object.
The volume of a rectangle is 0. It is a 2-dimensional object and so has no volume.
The measure, in cubic centimetres IS the volume!
mass divided by volume