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OpenStudy (anonymous):
several mathematic formulas involving Pi, radius or diameter.
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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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