Greek letter Pi, illustration. The number pi is a mathematical constant, defined as the ratio of a circle's circumference to its diameter. It is used

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Greek letter Pi, illustration. The number pi is a mathematical constant, defined as the ratio of a circle's circumference to its diameter. It is used in many formulas in all areas of mathematics and physics.

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Photo credit: © LAGUNA DESIGN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: , , character, circle, circular, circumference, constant, geometry, greek, irrational, letter, mathematical, mathematics, maths, number, pi, ratio, symbol