Pi (π) is a special number that represents the ratio of a circle's circumference to its diameter. It's approximately equal to 3.14159, but it goes on forever without repeating!
Pi Day is celebrated on March 14th (3/14) every year!
The symbol for pi (π) was first used in 1706 by William Jones.
The current world record for reciting digits of pi is 70,000 digits!
Enter the radius of a circle to find its circumference using pi!