pi

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Pronunciation[change]

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Noun[change]

Singular
pi

Plural
pis

Lower case pi
Pi is equal to a circle's circumference divided by its diameter
  1. Pi is a Greek letter written "π".
  2. (mathematics) Pi is a number that is found by dividing the circumference of a circle by its diameter. Pi is constant, it is always the same (close to 3.14159). It is usually written as "π"
    The distance around a circle is twice the radius times pi; C = 2πr.