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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 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.

  3. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    Because C bisects the arc from A to B, C′C perpendicularly bisects the chord from A to B, say at P. Triangle C′AP is thus a right triangle, and is similar to C′CA since they share the angle at C′. Thus all three corresponding sides are in the same proportion; in particular, we have C′A : C′C = C′P : C′A and AP : C′A = CA : C′C.

  4. Pi Day - Wikipedia

    en.wikipedia.org/wiki/Pi_Day

    Pi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number π, due to a pun based on the words "pi" and "pie" being homophones in English (/ p aɪ /), and the coincidental circular shape of many pies. [1] [19] Many pizza and pie restaurants offer discounts, deals, and free products ...

  5. 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

  6. Dancing on My Own - Wikipedia

    en.wikipedia.org/wiki/Dancing_On_My_Own

    "Dancing on My Own" was composed by Robyn and Patrik Berger. Featuring "elements of 'many different worlds'" she loves that make her "proud" of the track, including "80s rock ballads" and "queer electronica", [5] with the goal of releasing a record that would meet the standard of Prince, [22] two versions of the midtempo [27] ballad [28] were released for the album then for radio, where ...

  7. Proof that 22/7 exceeds π - Wikipedia

    en.wikipedia.org/wiki/Proof_that_22/7_exceeds_π

    Proofs of the mathematical result that the rational number ⁠ 22 / 7 ⁠ is greater than π (pi) date back to antiquity. One of these proofs, more recently developed but requiring only elementary techniques from calculus, has attracted attention in modern mathematics due to its mathematical elegance and its connections to the theory of Diophantine approximations.

  8. Pi (letter) - Wikipedia

    en.wikipedia.org/wiki/Pi_(letter)

    Pi (/ˈpaɪ/; Ancient Greek /piː/ or /peî/, uppercase Π, lowercase π, cursive ϖ; Greek: πι) is the sixteenth letter of the Greek alphabet, meaning units united, and representing the voiceless bilabial plosive IPA:.

  9. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

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