1/4 pie 3.14
if you're asking for the whole pie if the pie is 3.14 units then the whole pie is 12.56.
This is one possible interpretation, but kerlonr might also be asking about 1/4 * pi where pi = 3.14.
In that case, pi/4 = 0.785
However, the question is too ambiguous to know the true meaning.