What is the exact value of #pi#?
no one can give you the complete value of pi because as technology in searching for pi increases number of decimal places increases.
It is not expressible as a fraction, terminating or repeating decimal.
#pi = 4 * tan^(-1)(1) = 4 * (1-1/3+1/5-1/7+1/9-1/11+...)#
There are some useful rational approximations for
or of course, decimal approximations: