MATH

Mnemonic

How I wish I could calculate pi

3.141592


          Sir, I bear a rhyme excelling  
      In mystic force, and magic spelling
            Celestial sprites elucidate
        All my own striving can't relate
       Or locate they who can cogitate
            And so finally terminate.
                        Finis.

First of appearance of PI in a book by William Jones in the Geometry Section:

https://archive.org/details/SynopsisPalmariorumMatheseosOrANewIntroductionToTheMathematics/page/n235/mode/2up

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Generation of PI can be given by 

alpha = 2*sqrt(3)   beta = 1/3(alpha)  see = 1/3 (beta)  delta = 1/3 (see)  echo = 1/3(delta) ....

Pi is equal to:

alpha - 1/3(beta) + 1/5(see) - 1/7(delta) + 1/9 (echo) ...;