pi

Οο$\longleftarrow$ 16 $\longrightarrow$Ρρ

Pronunciation

• enPR: pī, IPA ^(key): /paɪ/
• SAMPA: /paI/

• Audio (US)

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• Audio (US)

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• Homophone: pie

Noun

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 , also accurate approx as ${\tfrac {355}{113}}$, or rough approx as ${\tfrac {22}{7}}$). It is usually written as "π"

   The distance around a circle is twice the radius times pi; C = 2πr.