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  2. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    With a correct value for its seven first decimal digits, this value remained the most accurate approximation of π available for the next 800 years. [58] The Indian astronomer Aryabhata used a value of 3.1416 in his Āryabhaṭīya (499 AD). [59] Fibonacci in c. 1220 computed 3.1418 using a polygonal method, independent of Archimedes. [60]

  3. Chronology of computation of π - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_computation...

    Value; Less than 22/7; ... giving the value of pi to 154 digits, ... Verification of the binary digits used a network of 9 Desktop PCs during 34 hours.

  4. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    Pi Hex was a project to compute three specific binary digits of π using a distributed network of several hundred computers. In 2000, after two years, the project finished computing the five trillionth (5*10 12), the forty trillionth, and the quadrillionth (10 15) bits. All three of them turned out to be 0.

  5. Antenna tuner - Wikipedia

    en.wikipedia.org/wiki/Antenna_tuner

    The 'T' ("Tee") network and the π ("Pi") network also have a shape similar to the English and Greek letters they are named after. This basic network is able to act as an impedance transformer. If the output has an impedance consisting of resistance R load and reactance j X load , while the input is to be attached to a source which has an ...

  6. 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.

  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. Chudnovsky algorithm - Wikipedia

    en.wikipedia.org/wiki/Chudnovsky_algorithm

    The Chudnovsky algorithm is a fast method for calculating the digits of π, based on Ramanujan's π formulae.Published by the Chudnovsky brothers in 1988, [1] it was used to calculate π to a billion decimal places.

  9. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

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