Why, might you ask, should anyone want to celebrate a mathematical constant which allows you to calculate the area inside a circle?
As unlikely as it may seem, the number pi, or 3.14159... has been crucial to the development of modern life. As far back as the ancient civilizations of Babylon and Egypt, people needed approximations of pi to deal with the flooding of the Tigris, Euphrates and Nile rivers, for astronomy, and for surveying and building ziggurats and pyramids. The ancient Greeks were the first to study pi for its own mathematical sake.
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