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Pi (π) is a mathematical constant representing the ratio of the circumference of a circle to its diameter. This ratio is approximately equal to 3.14159. The symbol π is derived from the Greek alphabet and is pronounced as "pie"12.
Decimal and Fractional Representation
Pi can be expressed in both decimal and fractional forms. The value of π in decimal form is non-terminating and non-repeating, making it an irrational number. The first 100 decimal places of π are:
3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679Calculating Pi
The value of π is calculated using the formula:
Ď€ = Circumference / Diameter - See more
See all on WikipediaPi - Wikipedia
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 … See more
Name
The symbol used by mathematicians to represent the ratio of a circle's circumference to its … See moreBecause π is closely related to the circle, it is found in many formulae from the fields of geometry and trigonometry, particularly those concerning circles, spheres, or ellipses. Other branches of science, such as statistics, physics, Fourier analysis, and number theory, … See more
• Blatner, David (1999). The Joy of π. Walker & Company. ISBN 978-0-8027-7562-7.
• See moreAntiquity
The best-known approximations to π dating before the Common Era were accurate to two decimal places; this was improved upon in See moreComputer era and iterative algorithms
The development of computers in the mid-20th century again revolutionized the hunt for digits of π. Mathematicians John Wrench and … See moreDescribing physical phenomena
Although not a physical constant, π appears routinely in equations describing fundamental principles of the universe, often because of π's … See more• Weisstein, Eric W. "Pi". MathWorld.
• Demonstration by Lambert (1761) of irrationality of π, online Archived 31 December 2014 at the Wayback Machine and analysed BibNum Archived 2 April 2015 at the Wayback Machine (PDF). See moreWikipedia text under CC-BY-SA license One Million Digits of Pi On One Page!- [Plus Guides …
Learn about pi and its properties, and see the first million digits of pi in a table. You can also calculate the circumference of a circle using pi and check out our Pi Day merch.
Pi ( π ) - Math is Fun
Pi (π) is the ratio of the circumference to the diameter of a circle, and it has no pattern in its decimal expansion. Learn how to calculate pi, its approximation, its di…
Pi | Definition, Symbol, Number, & Facts | Britannica
Mar 17, 2025 · Pi is the ratio of the circumference of a circle to its diameter, and is an irrational number with infinite decimal expansion. Learn about the history, …
Value of Pi in Maths - Definition, Forms & Solved …
May 26, 2019 · Learn what is the value of pi (Ď€), a mathematical constant that represents the ratio of the circumference and the diameter of a circle. Find out how to calculate pi using the pi formula and see examples of pi in decimal and …
Value of Pi | GeeksforGeeks
Apr 8, 2025 · Learn what is pi, how to calculate it, and its approximate and exact values in fractions, decimals, degrees, and radians. See solved examples on pi value and practice problems on value of pi.
Value of Pi - Symbol, Examples, Pi Values | What is Pi?
Learn what is pi, the ratio of the circumference of a circle to its diameter, and how to calculate it. Find out the value of pi in decimals, fractions, degrees, and its symbol π.
What is the value of pi? | Britannica - Encyclopedia Britannica
Mar 17, 2025 · The value of pi is approximately 3.14, or 22/7. Pi is an irrational number, which means it is not equal to the ratio of any two whole numbers. This also means pi can be …
What you need to know about pi (the number, not the …
Mar 10, 2025 · Learn what pi is, why it matters, how many digits we need to know and some fun facts about it. Pi is an irrational number that has an infinite number of digits and is used in geometry, engineering, software testing and more.
Greek Small Letter Pi - Wumbo
Learn about the pi symbol (Ď€), a geometric constant used in trigonometry and math formulas. Find out its code point, TeX, SVG, and numeric value of approximately 3.1416.
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