Question

y we use π pie y we can't use 22/7 in circle

Answer 1

we generally use π whose value we consider to be 22/7. another thing is that π has many approximations and 22/7 is considered too valid. therefore we use π and keep the value of 3.14 or 22/7 instead of π because its almost impossible to find its answer.

Answer 2

$\sf \pmb{Answer :}$

we generally use π whose value we consider to be 22/7. another thing is that π has many approximations and 22/7 is considered too valid. therefore we use π and keep the value of 3.14 or 22/7 instead of π because its almost impossible to find its answer.