What is Pi Day and why is pi important, according to a mathematician

Pi is so important that it is now celebrated on March 14. This is because March is the third month, making it 3.14, the first three digits of pi. To find out why pi is so important and how it surrounds us every day, we spoke with Eugenia Cheng, a mathematician and the author of "How to Bake Pi" and "Beyond Infinity."

This video was originally published on March 14, 2017.