Assuming the cross-section of the prism is such that its area is easily calculated,
Volume of prism = Cross-sectional area * length
If not, the most effective way is to submerge it in water and measure the volume of water displaced.
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Two different rectangular prisms can both have the same volume of 72 cm3
The volume of a rectangular prism is its cross-section area times its length.
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There is not enough information. Volume cannot be measured in cm so there is no way of knowing how big the original or small prisms are. Furthermore, the small prisms could be wide and squat or thin and long.