The earliest known textually evidenced approximations date from around NUMBER@1 BC ; they are NUMBER@2 -LRB- LOCATION@1 -RRB- and NUMBER@3 -LRB- LOCATION@2 -RRB- , both within NUMBER@4 % of the true value .

The first known approximations of pi are from around NUMBER@1 BC , and are NUMBER@2 -LRB- by the Babylonians -RRB- and NUMBER@3 -LRB- by the MISC@1 -RRB- .
