Casual Pi Day, also known as Pi Approximation Day, is all about celebrating the approximation in the fraction 22/7, or Pi.
The number π (Pi) is defined as the ratio of a circle's circumference to its diameter and is approximately equal to 3.14159. If you put the numbers in your calculator, you will see that 22 divided by 7 has an unending answer. The digits go on forever. That is why Pi is considered an approximate number and hence, the reason for today.
Celebrate Casual Pi Day today and show your math nerdiness!