Question

Why the value of  π is 22/7??

Answer 1

as it values to 3.14

Answer 2

the famous mathematical result that the rational number 22/7 is greater than π(pi) 

convince its readers that 22/7 (or 3 1/7) is indeed bigger than π; systematic methods of computing the value of π exist. If one knows that π is approximately 3.14159, then it trivially follows that π < 22/7, which is approximately 3.142857. But it takes much less work to show that π < 22/7 by the method used in this proof than to show that π is approximately 3.14159.