Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a ... No matter how big or small a circle is, this relationship will always be the same, which is why it's called ...

In 2009, the U.S. House of Representatives passed a resolution recognizing March 14 as National Pi Day. According to the Exploratorium, mathematicians began using π, the Greek letter pi ...

M arch 14 marks the annual celebration of the mathematical constant pi, aka the Greek letter π. Its infinite number of digits is usually rounded to 3.14, hence the date of Pi Day. For some people ...