*I remember when...*

*Hi! I'm Albert Einstein. I liked Pi Day because it's my birthday. What's the circumference divided by the diameter of a circle. It's as easy as pi! We got to eat pie, too! Yum!*

## Pi or Pie?Pi is a number that expresses the constant ratio of the circumference of a circle to its diameter. The Greek letter pi is used to represent this ratio. Pi is an infinite decimal and since its digits never repeat in a pattern and never end it is called an irrational number. The decimal 3.14 and the fraction 22/7 are frequently used approximations of pi.
Ancient civilizations discovered the concept of pi thousands of years ago. Since then people have worked hard to calculate as many digits of pi as they were able. In the 18th and 19th centuries pi was successfully calculated to hundreds of digits. In the 20th century, thanks to computers, pi has been calculated to billions of digits. |

*I remember when...*

*Multiplication, division, fractions - The typical math class. Wait! What? Pie? This is amazing! Pi is a math term. At Bushy Park Elementary, Mrs. Jensen is teaching her GT Math students about pi with pie! Anonymous*

I remember when we did Pi Day in March. We measured the circles and I really liked when we ate pie while coloring and talking. I also liked the part when we got the paper that said all the digits of pi within the symbol. M.R.

During our Pi Day celebration, we ate pie and did fun math experiments. S.P.

I remember when we did Pi Day in March. We measured the circles and I really liked when we ate pie while coloring and talking. I also liked the part when we got the paper that said all the digits of pi within the symbol. M.R.

During our Pi Day celebration, we ate pie and did fun math experiments. S.P.

## Discovering Pi

Students used string and rulers to measure the circumference and diameter of a variety of circles. Next they calculated the ratio of each pair of circumference and diameter. They were surprised to see how close those calculations always came to 3.14 or pi. We celebrated our successful demonstration of math magic by eating pie of course!