Some other approximations: http://www.math.tamu.edu/~dallen/masters/alg_numtheory/pi.pdf http://www.math.tamu.edu/~dallen/masters/alg_numtheory/pi.pd... And: h

Some other approximations: http://www.math.tamu.edu/~dallen/masters/alg_numtheory/pi.pdf http://www.math.tamu.edu/~dallen/masters/alg_numtheory/pi.pd... And: https://en.wikipedia.org/wiki/Approximations_of_%CF%80 https://en.wikipedia.org/wiki/Approximations_of_%CF%80 Babylons and early Chinese just used pi = 3. Romans used pi = 3.125.