![]() ![]() Equivalently, its decimal representation never ends and never settles into a permanently repeating pattern. ![]() īeing an irrational number, π cannot be expressed as a common fraction, although fractions such as 22 / 7 are commonly used to approximate it. It is also referred to as Archimedes's constant. The earliest known use of the Greek letter π to represent the ratio of a circle's circumference to its diameter was by Welsh mathematician William Jones in 1706. The number appears in many formulas in all areas of mathematics and physics. It is defined in Euclidean geometry as the ratio of a circle's circumference to its diameter, and also has various equivalent definitions. The number π ( / p aɪ/ spelled out as " pi") is a mathematical constant, approximately equal to 3.14159.
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