# Celebrate Pi Day!

## What Is Pi?

Pi (3.14159265359…) is the ratio of the circumference of a circle to the diameter. If you divide the circumference of any circle by the diameter, you will always get exactly the same number, Pi. Mathematicians use the symbol π to represent pi. That makes the formula for the relationship of the circumference of a circle to the diameter π= c/d.

While Pi is a constant, it is also irrational, meaning the number goes on forever, or infinite. You can see the first million digits at PiDay.org, but you can never see the last number.

## Learning About Pi

Anytime we assign a number or concept a symbol, it can seem complex and hard to understand. This isn’t true with pi. We can demonstrate pi with a hands-on activity that will make π easy to understand.

If your family loves math, check out Danica McKellar’s math books.

## Books About Pi

## Celebrate Pi Day!

Pi Day is celebrated each year on March 14 (3/14). There is even a website, PiDay.org, dedicated to the celebration of this irrational number. You can join the party by having some fun with pi! Here are some ideas:

Follow The Homeschool Scientist’s board Pi Day on Pinterest.

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