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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The Chinese mathematician Liu Hui in 263 CE computed π to between 3.141 024 and 3.142 708 by inscribing a 96-gon and 192-gon; the average of these two values is 3.141 866 (accuracy 9·10 −5). He also suggested that 3.14 was a good enough approximation for practical purposes.

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The sample mean of | W 200 | is μ = 56/5, and so 2(200)μ −23.19 is within 0.05 of π. Another way to calculate π using probability is to start with a random walk , generated by a sequence of (fair) coin tosses: independent random variables X k such that X k ∈ {−1,1} with equal probabilities.

  4. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    mathematical constant π. 3.14159 26535 89793 23846 26433... The following is a list of significant formulae involving the mathematical constant π. Many of these formulae can be found in the article Pi, or the article Approximations of π .

  5. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    For odd square, since there are (n - 1)/2 same sided rows or columns, there are (n - 1)(n - 3)/8 pairs of such rows or columns that can be interchanged. Thus, there are 2 (n - 1)(n - 3)/8 × 2 (n - 1)(n - 3)/8 = 2 (n - 1)(n - 3)/4 equivalent magic squares obtained by combining such interchanges. Interchanging all the same sided rows flips each ...

  6. The Method of Mechanical Theorems - Wikipedia

    en.wikipedia.org/wiki/The_Method_of_Mechanical...

    The region in the y-z plane at any x is the interior of a right triangle of side length whose area is (), so that the total volume is: which can be easily rectified using the mechanical method. Adding to each triangular section a section of a triangular pyramid with area x 2 / 2 {\displaystyle x^{2}/2} balances a prism whose cross section is ...

  7. List of sports - Wikipedia

    en.wikipedia.org/wiki/List_of_sports

    3.8 Subsurface and recreational. 3.9 Diving. ... Sports in which the method of scoring is through goals. ... Street workout; Strength sports. Strongman;

  8. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Name Symbol Decimal expansion Formula Year Set One: 1 1 Prehistory Two: 2 2 Prehistory One half: 1/2 0.5 Prehistory Pi: 3.14159 26535 89793 23846 [Mw 1] [OEIS 1]: Ratio of a circle's circumference to its diameter.

  9. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    Perfect number. In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.

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