## Let’s talk Pi (π)

Happy 3.14159265359 Day! That’s right, the 14 March is the annual worldwide celebration of Pi. Pi is represented by the Greek symbol π. Did you know that the number Pi (π) is a mathematical constant whose value is the ratio of any circle circumference (C) to its diameter (d) and is approximately equal to a rational expression of 3.14159. However, the Pi number is irrational meaning that it is a non-repeating, non-terminating decimal and continues to an infinite number of places without any pattern. Pi has been calculated by computers to 2.7 trillion digits so far. Now that is a lot of digits!

The number Pi is extremely useful when solving geometry problems involving circles and shapes. No matter how large or small a circle is, Pi will always work out to be the same number.

Pi Day is a celebration of mathematics and is a great opportunity for teachers to help their students discover and explore the mathematical constant. Teachers if you’re looking for a fun activity to help celebrate in the classroom well look no further. We recommend bringing cookies in for your students. Give each student a cookie and ask them to measure the diameter of their cookie in centimetres. Next, the students need to calculate the area and the circumference of their cookie using the correct formula. Once the students have completed this exercise they can enjoy their cookie. For more ideas and handy hints click here.

**Happy π Day from the Mathletics team!**