Because you can actually calculate pi using a certain number of mathematical equations. I used to be able to do that at Purdue but I've lost my touch. Pi is not just determined from guessing the circumference of a circle. It's also what is called a constant. Like the Bohr radius.Skans » 04 Oct 2023, 1:47 pm » wrote: ↑ Here's a test: Explain why Pi is a non-repeating, irrational number?