Arima Yoriyuki

Arima Yoriyuki

Template:Nihongo was a Japanese mathematician of the Edo period. He was the lord of Kurume Domain.

He approximated the value of $\pi$ and its square, ${\pi }^2$. In 1766, he found the following rational approximation of $\pi$, correct to 29 digits:

$\pi \approx \frac{428224593349304}{136308121570117}=3.14159265358979323846264338327(569...).$

Further reading

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