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Learn about pi, the ratio of the circumference of a circle to its diameter, and see the first million digits of its decimal expansion. You can also calculate the circumference of a circle using pi and check out our Pi Day merch.
- What Is Pi
The definition of pi gives us a way to calculate...
- What Is Pi
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.
Jun 25, 2024 · 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
- 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.
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.
Pi. Pi is an endless string of numbers. ( π) ( / paɪ /) is a mathematical constant that is the ratio of a circle 's circumference to its diameter. This produces a number, and that number is always the same. However, the number is rather strange. The number starts as 3.141592653589793 and continues without end.
