It probably appears an infinite number of times, but this hasn't been proven mathematically.
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If n is any integer, then (n/pi) times pi is a whole number.
No because 15 times pi is an irrational number
Pi is the number you have to use to solve many circle equations. If you want to find the area of a circle, use radius squared times pi. For the circumference, use diameter times pi.
It is still equal to pi (3.1416) because when you multiply anything by 1 no matter how many times you multiply it, you end up with that other number.