Manuals/calci/PI

PI()

Description

This function gives the value of $pi$ .
The $pi$ is a mathematical constant with a value approximate to 3.14159.
It is denoted by the Greek letter $\Pi$ .
$\Pi$ is commonly defined as the ratio of a circle's circumference $C$ to its diameter $d$ .
So $\Pi ={\frac {C}{d}}$ , the ratio ${\frac {C}{d}}$ is constant, and it is not considering the circle's size.
$\Pi$ is a transcendental number and irrational number.
Being an irrational number, $\Pi$ cannot be expressed exactly as a ratio of any two integers .
But we can express as the fraction ${\frac {22}{7}}$ is approximate to the $\Pi$ value , also no fraction can be its exact value.