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Mathematics 6 Online
OpenStudy (anonymous):

several mathematic formulas involving Pi, radius or diameter.

OpenStudy (anonymous):

\[ \frac{1}{\pi} = \frac{2\sqrt{2}}{9801}\sum^\infty_{n=0}\frac{(4n)!(1103+26390n)}{(n!)^4\cdot 396^{4n}} \]

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