what is pi

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Pi (the symbol is the Greek letter π) is:

The ratio of the Circumference 
to the Diameter 
of a Circle.

In other words, if you measure the circumference, and then divide by the diameter of the circle you get the number π

It is approximately equal to:


The digits go on and on with no pattern. In fact, pi has been calculated to over one million decimal places and still there is no pattern.


A quick and easy approximation to Pi is 22/7

22/7 = 3.1428571...

But as you can see, 22/7 is not exactly right. In fact Pi is not equal to the ratio of any two numbers, which makes it an irrational number.

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