Pi (the symbol is the Greek letter π) is:
The ratio of the Circumference to the Diameter of a Circle.
It is approximately equal to:
3.14159265358979323846…
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.
Here is Pi with the first 100 decimal places:
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