It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as 22 7 Īnd there is a unique positive real number π with this property. The number π appears in many formulae across mathematics and physics. The number π ( / p aɪ/ spelled out as " pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.
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