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Template:Japanese name Template:Nihongo was a Japanese mathematician of the Edo period. He was the lord of Kurume Domain and approximated the value of $\pi$ and its square, $\pi ^{2}$. In 1766, he found the following rational approximation of pi, correct to 29 digits:

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

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