Mathematicians tend to celebrate **3/14** as **Pi Day** in honour of the important relationship that exists between the circumference and diameter of any circle. Historians note that at least 2000 BC humans had noticed the constant ratio between these two parts of any circle, but it was not until 1706 that the notation using the Greek letter **π** was introduced by a man named William Jones.

This site http://www.educationworld.com/a_lesson/lesson/lesson335.shtml offers a whole host of ideas for exploring and celebrating Pi Day with students. Try singing this song (to the tune of Oh Christmas Tree) written by LaVern Christianson:

**Oh Number PI**

Oh, number Pi

Oh, number Pi

Your digits are unending,

Oh, number Pi

Oh, number Pi

No pattern are you sending.

You’re three point one four one five nine,

And even more if we had time,

Oh, number Pi

Oh, number Pi

For circle lengths unbending.

Oh, number Pi

Oh, number Pi

You are a number very sweet,

Oh, number Pi

Oh, number Pi

Your uses are so very neat.

There’s 2 Pi r and Pi r squared,

A half a circle and you’re there,

Oh, number Pi

Oh, number Pi

We know that Pi’s a tasty treat.

And here’s a quick video showing several approximations of pi: http://video.google.com/videoplay?docid=-6200593424291031420&hl=en

Have fun, and enjoy a slice of Pi!

Mathematically yours,

Carollee

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