“One seemingly simple number – 3.14 – has been essential to geometric calculations involving circles dating back to Archimedes. It’s celebrated this day – 3/14 – as Pi Day with that common circular dessert.
“Pi, as anyone who got past 8th grade math remembers, is the ratio of a circle’s circumference to its diameter – typically expressed as the simple decimal 3.14, the fraction 22/7, or the Greek letter π.
“So naturally, 3/14 – the 14th of March – is celebrated as “Pi Day.”
“And since 3.14 is the beginning, not the end of Pi – it can be decimaled on out to infinity – and since the next two numbers are 1 and 5 voila! today’s date 3/14/15 is really special.”
Read more: CSMonitor
