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Pi (math)

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If the radius of a circle is known, pi can be used to calculate the circumference or area of the circle.

Pi (represented by the letter π in the Greek alphabet) is a mathematical constant. Pi is an irrational number, which means that it cannot be represented exactly with a fraction or decimal. 3.14159 is the approximate value of pi to the 5th decimal place.

Arithmetic symbols.svg Mathematics Portal — All articles about mathematics.