What would you do? William Jones, a mathematician from Anglesey, was the first to use the π symbol for the Pi number. He realized that the number went on forever, so it needed a symbol.

It was first ... the value of Pi? A. 3.14159 B. 3.14358 C. 3.14258 D. 3.14289 Ans: A Explanation: The value of Pi is approximately 3.14159. It is mathematical constant and its symbol is π.

Pi day is celebrated every year on March 14th to recognise the importance of the mathematical constant. Pi is the ratio of a circle's circumference to its diameter and is approximately 3.14.