Arima Yoriyuki, Date of Birth, Date of Death

Arima Yoriyuki

Japanese mathematician and daimyo of the middle Edo period; 7th Lord of Kurume

Date of Birth: 31-Dec-1714

Date of Death: 16-Dec-1783

Profession: mathematician

Nationality: Japan

Zodiac Sign: Capricorn

Arima Yoriyuki (?? ??, December 31, 1714 – December 16, 1783) was a Japanese mathematician of the Edo period.
He was the lord of Kurume Domain. He approximated the value of p {\displaystyle \pi } and its square, p 2 {\displaystyle \pi ^{2}} .
In 1766, he found the following rational approximation of pi, correct to 29 digits: p ˜ 428224593349304 136308121570117 = 3.14159265358979323846264338327 ( 569... ) {\displaystyle \pi \approx {\frac {428224593349304}{136308121570117}}=3.14159265358979323846264338327(569...)}