It is an approximation, yes.
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22 over 7
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 .
pi is equal to 3.141592653589793238462643383279502884197169399375105...., pi is actually a endless mathematical ratio. pi is sometimes approximated by 22 over 7.
Pi has over two billion digits but you can use 3.14 or if you need a fraction 22/7