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  2. Machin-like formula - Wikipedia

    en.wikipedia.org/wiki/Machin-like_formula

    An insightful way to visualize equation 3 is to picture what happens when two complex numbers are multiplied together: ... In Pi Day 2024, ... 4: 1.1191: 685 601: 69 ...

  3. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  4. Bailey–Borwein–Plouffe formula - Wikipedia

    en.wikipedia.org/wiki/Bailey–Borwein–Plouffe...

    Using the P function mentioned above, the simplest known formula for π is for s = 1, but m > 1. Many now-discovered formulae are known for b as an exponent of 2 or 3 and m as an exponent of 2 or it some other factor-rich value, but where several of the terms of sequence A are zero. The discovery of these formulae involves a computer search for ...

  5. Slide rule scale - Wikipedia

    en.wikipedia.org/wiki/Slide_rule_scale

    The line, inscribed on wood, was a single logarithmic scale going from 1 to 100. It had no sliding parts but by using a pair of dividers it was possible to multiply and divide numbers. [ note 3 ] The form with a single logarithmic scale eventually developed into such instruments as Fuller's cylindrical slide rule .

  6. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    In other words, the n th digit of this number is 1 only if n is one of 1! = 1, 2! = 2, 3! = 6, 4! = 24, etc. Liouville showed that this number belongs to a class of transcendental numbers that can be more closely approximated by rational numbers than can any irrational algebraic number, and this class of numbers is called the Liouville numbers ...

  7. Leibniz formula for π - Wikipedia

    en.wikipedia.org/wiki/Leibniz_formula_for_π

    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 independently rediscovered by James Gregory in ...

  8. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The square root of 2 is equal to the length of the hypotenuse of a right-angled triangle with legs of length 1.. The square root of 2, often known as root 2 or Pythagoras' constant, and written as √ 2, is the unique positive real number that, when multiplied by itself, gives the number 2.

  9. Wallis product - Wikipedia

    en.wikipedia.org/wiki/Wallis_product

    Wallis derived this infinite product using interpolation, though his method is not regarded as rigorous. A modern derivation can be found by examining ⁡ for even and odd values of , and noting that for large , increasing by 1 results in a change that becomes ever smaller as increases.

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