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Holidays

Pi Day

What does Pi Day celebrate?

Pi Day celebrates the number pi, also written with the Greek letter π.

When is Pi Day celebrated?

March 14th. This is because the number π starts out with 3.14 and March 14th can be written 3-14.

Who celebrates this day?

This is just a fun day to celebrate math. It's mostly celebrated by mathematicians, math teachers, rock stars (just kidding), and math students.

What do people do to celebrate?

People do all sorts of crazy stuff to celebrate. They learn how to calculate the circumference of a circle. They memorize Pi to the 100th digit. They have math contests and see who can do their multiplications the fastest.

Some people may actually do fun stuff like having a pie eating contest with real pies such as apple or chocolate pies. Mmmmmm!

Fun Activities for Pi Day Why is Pi important?

Pi is defined as the ratio of a circle's circumference to its diameter. The circumference is the distance around a circle and the diameter is the distance across a circle. By using Pi you can figure out the circumference if you know the diameter using this equation:

C = π * D

Where C = circumference and D = diameter.

History of Pi Day

Historians believe that a number close to Pi was first used to figure the circumference of a circle around 4,000 years ago by the Babylonians. Around 200 BC the Greek mathematician Archimedes continued to work on getting a more accurate number for Pi. In the 1600s, mathematicians such as Isaac Newton used math called infinite series to get even more accurate numbers. The Greek letter π was first used as the symbol for the number by Swiss mathematician Leonhard Euler.

The first organized Pi Day was in 1988 at the San Francisco Exploratorium. Physicist Larry Shaw had the idea to celebrate the day by marching around a circle and then eating some pies. They still have the celebration today.

In 2009 the US government recognized the day as National Pi Day.

Pi Goes on Forever

As far as we know the number Pi goes on forever. It never repeats and never ends. In math you can use an approximation like 3.14159.

Fun Facts About Pi Day March Holidays
Read Across America Day (Dr. Seuss Birthday)
Saint Patrick's Day
Pi Day
Daylight Saving Day

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