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The REAL Life of Pi: Ethereal, Romantic, Mysterious And Completely Memorizing. The History, Explanation & Love for π is a universal known mathematical constant. Pi is the ratio of a circle’s circumference (distance around the circle, represented by the letter C) to its diameter (distance across the circle at its widest point) Pi is only an approximation because the decimals are infinite and ultimately unknowable. Pi was first calculated by Greek mathematician, Archimedes of Syracuse (287–212 BC)