Pi belongs to a huge mathematical group called irrational numbers, which go on forever and cannot be written as fractions. Scientists have calculated pi to 105 trillion digits, although most of us are more familiar with the approximation 3.14. But how do we know that pi is an irrational number?

Pi, which is the ratio of a circle's circumference to its diameter, is celebrated with its own holiday on March 14.

Kyle Tanis teaches ciLiving host, Jaclyn Friedlander about Pi!