## Pi from Voyager and an Intelino Smart Train

*Introduction to Pi*

There is probably no number that has received more interest since ancient times that the number pi, symbolized by the Greek letter *π*. Originally defined as the ratio of the circumference of a circle to its diameter, it has been given approximate values including 3.14 and 22/7. Proven to be an irrational number, supercomputers have computed the value of pi to more than one trillion digits.