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Solid geometry
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==History== The [[Pythagoreanism|Pythagoreans]] dealt with the [[regular solid]]s, but the pyramid, prism, cone and cylinder were not studied until the [[Platonism|Platonist]]s. [[Eudoxus of Cnidus|Eudoxus]] established their measurement, proving the pyramid and cone to have one-third the volume of a prism and cylinder on the same base and of the same height. He was probably also the discoverer of a proof that the volume enclosed by a sphere is proportional to the cube of its [[radius]].<ref>Paraphrased and taken in part from the ''[[1911 Encyclopædia Britannica]]''.</ref>
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