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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    Of some notability are legal or historical texts purportedly "defining π" to have some rational value, such as the "Indiana Pi Bill" of 1897, which stated "the ratio of the diameter and circumference is as five-fourths to four" (which would imply "π = 3.2") and a passage in the Hebrew Bible that implies that π = 3.

  3. 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, ... [1] For example, the ... Pi 3.14159 26535 89793 ...

  4. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    In ancient China, values for π included 3.1547 (around 1 AD), (100 AD, approximately 3.1623), and ⁠ 142 / 45 ⁠ (3rd century, approximately 3.1556). [55] Around 265 AD, the Wei Kingdom mathematician Liu Hui created a polygon-based iterative algorithm and used it with a 3,072-sided polygon to obtain a value of π of 3.1416.

  5. 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]

  6. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    Value; Less than 22/7; Approximations; ... A History of Pi; In culture; Indiana pi bill; Pi Day; ... Magnetic permeability of free space: [note 1]

  7. Chronology of computation of π - Wikipedia

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

    1 TB SATA II (Boot drive) – Hitachi (HDS721010CLA332), 5× 2 TB SATA II (Store Pi Output), 24× 2 TB SATA II (Computation) Windows Server 2008 R2 Enterprise (x64) Verification: 1.86 days (Bellard formula) and 4.94 days (BBP formula) 371 days 10,000,000,000,050 = 10 13 + 50 28 December 2013 Shigeru Kondo [53] using y-cruncher 0.6.3

  8. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    The constants listed here are known values of physical constants expressed in SI units; that is, physical quantities that are generally believed to be universal in nature and thus are independent of the unit system in which they are measured. Many of these are redundant, in the sense that they obey a known relationship with other physical ...

  9. Indiana pi bill - Wikipedia

    en.wikipedia.org/wiki/Indiana_Pi_Bill

    The Indiana pi bill was bill 246 of the 1897 sitting of the Indiana General Assembly, one of the most notorious attempts to establish mathematical truth by legislative fiat. Despite its name, the main result claimed by the bill is a method to square the circle .