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It is an approximation, yes.
22/7 is a very good approximation of pi (it's around 3.14159...). Pi is nowhere near 45, nor is it close to 22/45 .
No. 22/7 is a close approximation. pi is an irrational number so there is no ratio of integers that will equal pi.
22/7=3.14286 Which is a fair approximation to Pi, but 355/113 =3.14159 and is a much better approximation.
Quite simply, somebody noted that 22/7 is a fairly close approximation of the value of pi.