Pi is most commonly used in certain computations regarding circles. Pi not only relates circumference and diameter. Amazingly, it also connects the diameter or radius of a circle with the area of that circle by the formula: the area is equal to pi times the radius squared.
Additionally, pi shows up often unexpectedly in many mathematical situations. For example, the sum of the infinite series. The importance of pi has been recognized for at least 4, years. A History of Pi notes that by B. Both the Babylonians and Egyptians had rough numerical approximations to the value of pi, and later mathematicians in ancient Greece, particularly Archimedes, improved on those approximations. By the start of the 20th century, about digits of pi were known. With computation advances, thanks to computers, we now know more than the first six billion digits of pi.
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