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A brief history of pi
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The Man Who Invented Pi | History Today
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To Eudoxus of Cnidus (c. 400–350 bce) goes the honour of being the first to show that the area of a circle is proportional to the square of its radius. In today’s algebraic notation, that proportionality is expressed by the familiar formula A = πr2. Yet the constant of proportionality, π, despite its familiarity, is highly mysterious, and the quest to understand it and find its exact value has occupied mathematicians for thousands of years. A century after Eudoxus, Archimedes found the first good approximation of π: 31071
“I am undecided whether or not the Milky Way is but one of countless others all of which form an entire system. Perhaps the light from these infinitely distant galaxies is so faint that we cannot see them.” -Johann Lambert
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