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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 .
Celebrate Pi Day (3.14) this March 14 with some extra laughs.
Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π, and it was first celebrated in the United States. [2] [3] It was founded in 1988 by Larry Shaw, an employee of the San Francisco science museum, the Exploratorium.
In mathematics, the Leibniz formula for π, named after Gottfried Wilhelm Leibniz, states that. an alternating series . It is sometimes called the Madhava–Leibniz series as it was first discovered by the Indian mathematician Madhava of Sangamagrama or his followers in the 14th–15th century (see Madhava series ), [1] and was later ...
Euler's identity. In mathematics, Euler's identity [note 1] (also known as Euler's equation) is the equality. is pi, the ratio of the circumference of a circle to its diameter. Euler's identity is named after the Swiss mathematician Leonhard Euler. It is a special case of Euler's formula when evaluated for .
mathematical constant π. 3.14159 26535 89793 23846 26433... The following is a list of significant formulae involving the mathematical constant π. Many of these formulae can be found in the article Pi, or the article Approximations of π .
A History of Pi was originally published as A History of π in 1970 by Golem Press. This edition did not cover any approximations of π calculated after 1946. A second edition, printed in 1971, added material on the calculation of π by electronic computers, but still contained historical and mathematical errors, such as an incorrect proof that ...
Category:Pi. Category. : Pi. Wikimedia Commons has media related to Pi. This category includes articles related to the mathematical constant pi ( π ), which represents the ratio of a circle 's circumference to its diameter. For other uses, see Pi (disambiguation) .
Image:Pi-unrolled-720.gif: Animation of the act of unrolling a circle's circumference, illustrating the ratio π. A previous version of this image was nominated for FP; several objections were raised. A workshop was operated, concerns aired, and a great many changes made. Some prior objections, with comments: badly needs antialiasing.
Wikipedia:Today's featured picture (animation)/January 20, 2007. An animated image showing the definition of pi. A number line is marked off by a circle of unit diameter. Starting from zero, the circle "unrolls" its circumference. At one full turn, the unrolled circumference has extended to the point we call π.
