Pi day

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So it is pi day!!

Is it a day when math departments around the world offer visitors a cornucopia of bacchanalian delights?

No, but it is a day to celebrate pi!

What is pi?

I'm glad you asked that. I used to ask that question to my students in college math classes.
It never bothered me that they would usually say 3.14 or add on some more decimals.
They were taught to focus first on the numerical value of things, not their meaning. Therefore, one shouldn't fault them for having their first reaction be to offer a value for, rather than a definition of, pi.

So I would clarify my question. No, not the decimal approximation of the value of pi, I am asking you for the definition of pi. What does it mean?

Some knew, some didn't, and some could figure it out.

But some did not believe that something like pi needed a definition.
In their mind it had always been there, sitting on the left hand of God.
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