Pi

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Pronunciation

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Noun

Lower case pi

Pi is equal to a circle's circumference divided by its diameter

1. Pi is a Greek letter written "π".
2. Template:Math 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 $\frac{355}{113}$, or rough approx as $\frac{22}{7}$). It is usually written as "π"

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