Tag: pi


Approximating Pi (Happy Pi Day)

Posted in Mathematics

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Favorite Pi Approximations

What's your favorite \(\pi\) approximation?

Some of my favorite approximations of \(\pi\) come from Ramanujan-Sato series. These are mathematical series that generalize from a remarkable formula for \(\pi\) given by Srinivasa Ramanujan, an Indian mathematician:

$$ \pi^{-1} = \dfrac{\sqrt{8}}{99^2} \sum_{k \geq 0} \dfrac{ (4k)! }{ \left( 4^k k! \right)^4 } \dfrac{ 1103 + 26390k }{ 99^{4k} } $$

This completely novel formula opened up new branches of mathematics and provided a whole new class of \(\pi\) approximations (the Ramanujan-Sato series) and approximations that are extremely accurate, making them very useful for computer applications. (Each term of …



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