Pi is an interesting number. It is defined as the ratio of a circle’s circumference to its diameter, which ancient civilisations realized to be a constant. Given a circle with a diameter D or radius r and circumference C, mathematically, it is expressed as pi = C/D or pi = C/2r.

We’ve come across different numbers such as 22/7, 3.14, 3.1416 as the value of pi in solving mathematical problems relating to circle or circular shape. In other words, pi appears to be not having an exact numeric value. Is it a rational number that can be expressed as a fraction? How can we determine its value?