$${\frac{{\mathtt{3.141\: \!592\: \!653\: \!589\: \!357\: \!8}}}{{\mathtt{2}}}} = {\mathtt{1.570\: \!796\: \!326\: \!794\: \!678\: \!9}}$$
"Pi" is irrational.. it cannot be expressed as a fraction
It is the ratio of a circle's circumference to its diameter.
