Pi (π) is one of the most important constants in geometry and advanced mathematics. It stands for the ratio of a circle's circumference to its diameter. This works for

*any*circle; if you measure the circumference and the diameter, and take the ratio, it will always simplify to approximately 22/7, or 3.14159265358979323846264338327950288419716939937510...

Pi is an irrational number, and has an infinite number of non-repeating decimal places. Currently, over 1 trillion digits of pi have been calculated, but we will never reach the end. However, for most applications, 3.14 is a good enough approximation. As March 14th is abbreviated 3/14, we celebrate this handy constant.

So have a slice of pie, and a happy pi day!

To learn more about Pi, check out http://www.piday.org/.

## 2 comments:

22/7 is also an approximation (as it is a rational number).

Also, rational numbers can have an infinite number of decimal places. For example, 2/3.

You're right. Thanks for the corrections. It should say that pi has an infinite number of non-repeating decimal places. I will make those couple edits.

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