Pi Day is celebrated annually on March 14 to highlight the importance of the mathematical constant pi and how it simplifies calculations for us.
The day was founded in 1988 by Larry Shaw, who was an employee of the San Francisco Science Museum, the Exploratorium.
Pi Day falls on March 14 of every year, since 3 (month of March), 1 and 4 digits are the first significant figures of pi.
Pi is an important constant in Mathematics, Statistics and Physics. It is the ratio of the circumference of the circle to the diameter. The ratio is a constant of 3.14.
Pi Day is observed in many ways, including eating pies, throwing pies and discussing the significance of the constant pi. Many pizza and pie restaurants in the US offer discounts, deals, and free products on Pi Day.