Pi

Pi

About Pi

The number pi (symbol: _o)is a mathematical constant that is the ratio of a circle's circumference to its diameter, and is approximately equal to 3.14159. It has been represented by the Greek letter "_o" since the mid-18th century, though it is also sometimes written as pi. _o is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers (such as 22/7 or other fractions that are commonly used to approximate _o); consequently, its decimal representation never ends and never settles into a permanent repeating pattern. The digits appear to be randomly distributed, although no proof of this has yet been discovered. _o is a transcendental number aon a number that is not the root of any nonzero polynomial having rational coefficients. The transcendence of _o implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straight-edge.

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