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Archimedes British & World English

(Circa 287–212 bc), Greek mathematician and inventor, of Syracuse. He is famous for his discovery of Archimedes’ principle (legend has it that he made this discovery while taking a bath, and ran through the streets shouting ’Eureka!'); among his mathematical discoveries are the ratio of the radius of a circle to its circumference, and formulas for the surface area and volume of a sphere and of a cylinder

Archimedes' principle British & World English

A law stating that a body totally or partially immersed in a fluid is subject to an upward force equal in magnitude to the weight of fluid it displaces