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What number pops up when you see anything that's round?
What number pops up when you're analyzing sound?
What number seems to be a fundamental of our world?
Showing the secrets of math unfurl.

Now you might be thinking of a number around three
But that number is wrong, but you might not see
Why it's wrong, I'm gonna tell you why
It's based on the diameters and not the radii!

Have you noticed that in most cases it is twice pi
Except in the area, a single pi flies
But it is the circumference's integral dee-r
The radius, not diameter, by far

Twice pi makes more sense, as you can see
It's the real circle constant to be
It also makes the unit circle much easier
If you don't believe me just ask your teacher.

Pi, pi, mathematical pi
Use tau instead which is twice 3.14159
Pi, pi, mathematical pi
Tau is based on the diameters and not the radii.

Pi, pi, mathematical pi
Why you're the circle constant I really don't know why
Pi, Pi, mathematical pi,
I really think you should say goodbye