About pi

The number π is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

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Facts from Wikidata (CC0). Image by John Reid via Wikimedia Commons (CC BY-SA 3.0).

pi

constant ratio of the circumference of a circle to its diameter

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Facts from Wikidata (CC0). Image by John Reid via Wikimedia Commons (CC BY-SA 3.0).

Not who you're looking for? Others named pi: 1998 film directed by Darren Aronofsky · art project · ancient Chinese state · Chinese surname (皮)