What are some interesting approximations of pi?

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    Approximate Pi Value
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SUMMARY

The discussion centers on various interesting approximations of pi, highlighting notable values such as $\frac{22}{7}$, $\frac{355}{113}$, and the sum of surds $\sqrt{2} + \sqrt{3}$. The approximation $\frac{355}{113}$ is particularly significant as it accurately represents the first six decimal digits of pi despite its three-digit numerator and denominator. Additionally, a mnemonic for pi, "May I have a large container of coffee," is mentioned, where the letter count corresponds to the digits of pi. The "Wagon Wheel Approximation of Pi" was also featured on Wolfram during Pi Day.

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  • Understanding of mathematical approximations
  • Familiarity with continued fractions
  • Basic knowledge of surds and their properties
  • Awareness of mnemonic devices for memorization
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  • Research the mathematical significance of continued fractions in approximating irrational numbers
  • Explore additional mnemonics for memorizing pi and other mathematical constants
  • Investigate the history and applications of the approximation $\frac{355}{113}$
  • Learn about the "Wagon Wheel Approximation of Pi" and its mathematical implications
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kaliprasad
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we know a couple of approximate values of $\pi$ mostly $\frac{22}{7}$ and $\frac{355}{133}$ but one I found (from the net )interesting was sum of 2 surds $\sqrt{2} + \sqrt{3}$.if anyone is aware of other of interesting observation kindly let me know.
 
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Not an approximation but a mnemonic: "May I have a large container of coffee". The number of letters in each word: 3.1415926.
 
There is a collection of weird and wonderful approximations for pi here. My favourite is the approximation $\frac{355}{113}$, which gives the first six decimal digits of $\pi$ correctly, even though the numerator and denominator of the fraction have only three digits. The reason for that is that the following term in the continued fraction expansion of $\pi$ is the large number 292.
 
pi - log(23.141) = .000013282...
 

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