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  2. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") 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 curve.

  3. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    Consider all cells (x, y) in which both x and y are integers between − r and r. Starting at 0, add 1 for each cell whose distance to the origin (0, 0) is less than or equal to r . When finished, divide the sum, representing the area of a circle of radius r , by r 2 to find the approximation of π .

  4. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    "The amazing number π " (PDF). Nieuw Archief voor Wiskunde. 5th series. 1 (3): 254– 258. Zbl 1173.01300. Kazuya Kato, Nobushige Kurokawa, Saito Takeshi: Number Theory 1: Fermat's Dream. American Mathematical Society, Providence 1993, ISBN 0-8218-0863-X

  5. Euler's identity - Wikipedia

    en.wikipedia.org/wiki/Euler's_identity

    The number e (e = 2.71828...), also known as Euler's number, which occurs widely in mathematical analysis The number i , the imaginary unit such that i 2 = − 1 {\displaystyle i^{2}=-1} The equation is often given in the form of an expression set equal to zero, which is common practice in several areas of mathematics.

  6. Want an excuse for pie? National Pi Day is March 14 ... - AOL

    www.aol.com/want-excuse-pie-national-pi...

    For National Pi Day, Lakefront Brewery has pie slices that include strawberry pie, French silk, gluten-free caramel apple and pecan and cherry rhubarb. Location: 1872 N. Commerce St., Milwaukee

  7. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    Here, the Greek letter π represents the constant ratio of the circumference of any circle to its diameter, approximately equal to 3.14159. One method of deriving this formula, which originated with Archimedes, involves viewing the circle as the limit of a sequence of regular polygons with an increasing number of sides

  8. Google's Pi Day Map Reveals the Most Popular Pies in ... - AOL

    www.aol.com/googles-pi-day-map-reveals-173400151...

    Did you know that there's a day dedicated to pie? Or should we say Pi! March 14th marks the annual Pi Day, a day dedicated to honoring the mathematical constant pi or π (aka 3.14).The day is also ...

  9. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Pi 3.14159 26535 89793 ... Foias constant is the unique real number such that if x 1 = ... for rational x greater than or equal to one. before 1996 Metallic mean ...