I’ll group on this page frequently asked questions about Pi, with short answers or references and links to more complete explanations when available.
Why is Pi important?
Pi is a fundamental mathematical constant that defines the ratio of a circle’s circumference to its diameter. This ratio is always the same for any circle, making pi essential for all calculations involving circles and related shapes like spheres, cylinders, and cones. This enables accurate measurement of areas, volumes, and circumferences in geometry and engineering.
Pi is crucial in advanced mathematics and trigonometry. It simplifies the understanding of periodic functions and complex mathematical relations such as Euler’s formula. This makes Pi indispensable in calculus, physics and digital signal processing.
Is 22/7 the correct value of Pi?
Pi is an irrational number, which means that it is not the ratio of two integers. 22/7, which is about 3.1428, is thus only an approximation of Pi with three correct digits.