July 22 is Pi Approximation Day. Also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (π). Pi denotes the relationship between a circle's circumferences, its diameter and is denoted by the fraction 22/7 which calculates approximately to 3.14. As part of Pi Approximation Day, mathematics department conducted a speech, song, quiz, and familiarize some famous mathematicians and explained about their contributions.