the formula for the volume of a cuboid is quite simple,it is length multiply by width multiply by height.That's all.
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2cm*5cm*3cm=30cm3The volume of the cuboid: 2*5*3 = 30 cubic cm
With great difficulty because more information about the dimensions of the cuboid are required.
It is a cuboid
In the case of a rectangular cuboid, I would say that the volume is simply DEFINED to be length x width x height. The volume of other, more complicated shapes, can then be derived, based on this basic definition. But you do need to have a starting point, i.e., "How is volume even defined in the first place?"Just to show that this definition makes sense, think of a rectangular cuboid as having integer values for length, width, and height. In that case, you can divide it into unit cubes (cubes of side length 1), and it is easy to see (basically, by counting the unit cubes) that the number of unit cubes will be length x width x height - IN THIS SPECIAL CASE.
3 x 4 x 5 = 60cm3