“Pi Day” was celebrated in many countries on March 14. Pi (π) is the name of a constant number in mathematics that represents the relationship between a circle’s diameter (its width) and its circumference (the distance around the circle). The value of the number is 3.1415926535… (and its digits go on forever). Over one trillion digits of Pi after its decimal point have been calculated. Since March 14 is written as 3/14 in some countries, this day is celebrated as Pi Day. Many people ate and gifted food that was in the shape of a circle (pizza and pies) to celebrate the number. Albert Einstein, one of the world’s greatest scientists, was born on Pi Day.

Here is a Pi rap.

### Did you know?

The official world record for a person reciting the most digits of Pi beyond its decimal point is held by Chao Lu from China. He recited 67,890 decimal places of Pi. Akira Haraguchi from Japan is said to have recited 100,000 digits, but it is not an official record.