If you aren’t a mathematician or even a closeted nerd—or
maybe you have just blocked your traumatic high school trigonometry
experience—Pi is the irrational number that measures the circumference of the
circle.
Actually, Pi doesn’t measure the circumference of a circle;
you have to multiply the diameter and then multiply that diameter by Pi to get
the circumference of that circle. A more accurate way to describe it, then,
might be to call the value of Pi the ratio of the circle circumference to its
diameter.
And you multiply the diameter by “Pi” and not an actual
number because Pi is a simple, endless, non-repeating decimal. The actual
number is 3.141592653…and so on…
Simplifying the number, many use the approximation of 22/7
(twenty-two-sevenths).
source: Pioneer News
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