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The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
Pi is the ratio of the circumference of a circle to its diameter, and it is an irrational number with infinite decimal places. Learn about the history, calculation, and applications of pi in mathematics, physics, and engineering.
- The Editors of Encyclopaedia Britannica
- Pi is the ratio of the circumference of a circle to its diameter.
- The value of pi is approximately 3.14, or 22/7. To 39 decimal places, pi is 3.141592653589793238462643383279502884197. Pi is an irrational number,...
- The symbol for pi is π. It was devised by British mathematician William Jones in 1706 to represent the ratio and was later popularized by the Swiss...
- Pi is used for solving problems involving the lengths of arcs or other curves, the areas of ellipses, sectors, and other curved surfaces, and the v...
Learn about the definition, properties, and applications of pi, the ratio between a circle's circumference and diameter. Explore how to approximate pi using polygons, statistical techniques, and simulations.
Pi is the ratio of a circle's circumference to its diameter, and it is an irrational and transcendental number. Explore the history, properties, and applications of pi in mathematics and beyond.
Pi (π) is the ratio of the circumference of a circle to its diameter, an irrational number that can be approximated by 3.14. Learn how pi is used in geometry, trigonometry and other branches of mathematics, and see examples of formulas for circle, sphere, cylinder and cone.
Learn what pi (π) is, how to find it and use it for circles, and why it has no pattern in its digits. Explore pi day, approximations, series, and more with examples and activities.
