It's 22/7, and zeno's paradox aside, pi has an infinite component to it, if you look at it the wrong way.

That the horn's tail (or mouth piece, as it were) extends into an infinitely small value approaching zero, is as fair as the never-ending irrational fraction pi represents.

Otherwise, the horn's volume is undefined. Where does the tip of the horn cross zero?

It doesn't??? Hmmm, that sounds like a non-finite value to me.

Discussions like this often wax political more than analytical. There are four lights.