Pi is not just extremely long, it's infinite. The ratio of circumference to diameter of a circle in fractional form is 22/7 . Dividing a prime or a multiple of a prime (x), by the prime (y) will always be infinite. So dividing 22 (a multiple of 11 which is a prime) by 7 (a prime) is infinite.
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No. pi was known long before.
The value of Pi is 3.14 so the value of Pi by 2 is 6.28.
long number
pi was found when they realized that the radius of any circle is the amount of the perimeter multiplied by pi aka 3.14 and so on.
Pi is an irrational number, so when we're solving with pi, we usually round it to something like 3.14. If we use 3.14 as pi in this problem, we get 84.78.