Question

approximations of pi....

Answer 1

hey friend
$the \: value \: of \: \pi = 3.14 \: or \: \frac{22}{7}$
you can put value 3.14 as pi

Answer 2

it is not defined.
if we start dividing 22 by 7 the answer will not come exact.
so we use 3.----- digits after it.