Pi is the ratio of the circumference to the diameter of a circle, and it is a very useful number in maths. For example, to calculate the area of a circle you multiply pi by the square of the radius (that's the distance from the centre to the side
CLEVELAND, Ohio — It's Pi Day, that one day of the year people celebrate mathematics while enjoying a slice of discounted pie. Pi Day was first celebrated on March 14 (3.14, get it?) in San Francisco in 1988. It became National Pi Day in 2009 after
You know, March 14. 3/14 is sort of like 3.14. Get it? OK, it's a bit of a stretch because 3/14 looks like a fraction and not Pi. Whatever. We still call it Pi Day. Even if the date of Pi Day is a little weird, Pi is still pretty awesome. Here are some
Mathematician Carlos Castillo-Chavez says that Pi is so important to math that using its simple, geometric definition denies its greater powers. "[Pi] brings you into the world of mathematics, which is magic, mysterious and exciting and always full of
Happy Pi Day 2016! What is Pi Day and why is it so special? Today is March 14, 2016. The date resembles the ratio of a circle's circumference to its diameter which is 3.14159265359, 3.14 for short and this year math lovers are calling it "Rounded Pi