There is no general rule. There are different formulae for simple figures like a sphere, a cone and a cylinder. Other figures have yet other and more complex formulae.
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It is the volume of the figure.
There is no "space" inside a solid figure (body).However the solid figure can be measured in terms of its volume (the amount of space it occupies).
There are infinitely many figures and so infinitely many formula and therefore it is impossible to give ALL of them.
It is its volume which is measured in cubic units
A prism is a solid geometric object. If you know its shape and dimensions you can calculate its volume.