pi is just a number, it is not a machine. It is defined as the circumference/diameter of any circle, the result although defined by a ratio is an irrational number (can't be writt
en as a ratio of integers).
Pi is also, 3.14, as in the distance of a circle.
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The value of pi = circumference/diameter
Circumference = pi*diameter or 2*pi*radius
Twice the radius times pi or the diameter times pi
The area sector of a circle needs pi to work it out.
Yes