====== Pi() ======
Category:  Number function

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=====Description=====
This function returns the value of [[https://en.wikipedia.org/wiki/Pi|Pi]] (**π**): 3.1415926535897932384626433833…

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=====Arguments=====
This function requires no arguments.

**Return value type:**  Number

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=====Remarks=====
Pi is an //irrational number// with no final digit and can be represented by the fraction <sup>22</sup>/<sub>7</sub> .

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=====Examples=====

  pi() //Returns 3.1415926535897932384626433833

  pi() * 2 * 3 //Returns 18.85  (Circumference of a circle with a radius of 3.)

  pi() * square(3) = 28.27  (Area of a circle with a radius of 3.)