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mathematical constant π. 3.14159 26535 89793 23846 26433... The number π ( / paɪ /; 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
- What is pi?Pi is the ratio of the circumference of a circle to its diameter.
- What is the value of pi?The value of pi is approximately 3.14, or 22/7. To 39 decimal places, pi is 3.141592653589793238462643383279502884197. Pi is an irrational number,...
- What is the symbol for pi?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...
- What are the uses of pi?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...
- Finding Pi Yourself. Draw a circle, or use something circular like a plate. Measure around the edge (the circumference): I got 82 cm. Measure across the circle (the diameter)
- Using Pi. We can use π to find a Circumference when we know the Diameter. Circumference = π × Diameter. Example: You walk around a circle which has a diameter of 100 m, how far have you walked?
- Radius. The radius is half of the diameter, so we can also say: For a circle with a radius of 1. The distance half way around the circle is π = 3.14159265...
- Digits. π is approximately equal to: 3.14159265358979323846… The digits go on and on with no pattern. π has been calculated to over 100 trillion decimal places and still there is no pattern to the digits, see Pi Normal.
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 (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.
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.
The constant pi, denoted , is a real number defined as the ratio of a circle 's circumference to its diameter , (1) (2) has decimal expansion given by. (3) (OEIS A000796 ). Pi's digits have many interesting properties, although not very much is known about their analytic properties.
