Pi Day (March 14)

Why is there a special day for Pi, the ratio of a circle's circumference (distance around the circle) to its diameter (distance across the circle)? What makes Pi so special?

There's a day for celebrating pi. Learn what pi is, both the number and the symbol, and how March 14th was chosen as its special day.

The value commonly known as 3.14 -- celebrated on March 14th, or 3/14 -- refers to the ratio of a circle's circumference to its diameter

CBC has very helpfully compiled a list of songs that are perfect for Pi Day. Videos are included.

The objective of this website is to convince the world that mathematics is fun and bring attention to mathematicians’ favorite number, Pi. Learn about Pi, watch some videos and see some Pi in action.

Fun Pi resources from Education World

Numberphile did something crazy - attempted to calculate Pi using real Pies. Watch and see how close they got to the real figure of 3.14159265359. Related Lesson

Did you know that we've known the number of pi for over 4,000 years? Or that the number represented by pi has infinite numerals? Related Lesson