# pi

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