The Two Sides of Pi

First of all, what is pi?
Pi is an irrational number, or, a number that goes on perpetually without ever repeating itself. Ever.
For more detailed information, click on this link.
From Annis- Pi is AWESOME! it's this crazy Greek letter symbolizing the ration of the circumference of a circle to its diameter.
Strix - Oi, Annis, stop editing my posts! Seriously! Sorry for that.
Anyway, right, pi is the sixteenth Greek letter. Pi is also used as the ratio (not ration) of the circumference of a circle to its diameter.
Pi can be very useful and very useless.
Pi can be useful because it is used everywhere in math, science, and physics. It's famous for that. Pi is ancient, all the way back to the Mesopotamians. Pi is used to calculate the area and circumference of a circle and used to find the surface area and volume of spheres and cylinders.
But so what? Sure pi is famous, the pop star of the other numbers. But we can do without pop stars like Justin Beiber or Miley Cyrus in the real world. We can surely do without pi. What about those who are not scientists, mathematicians, or physicists? What of the teachers and politicians and artists? They never use pi. There is never a situation where there is a dire need of pi. We use other numbers but not pi and the other irrational numbers. What use is there of a number that never ends? Pi doesn't affect most people.
So is pi useful or useless? Ask yourself and comment the answer.
UPDATE (AGAIN) - It doesn't really matter if pi is useless or not. It is the discovery of something that makes it worthwhile. Ancient civilizations knew that pi was about 3 but they did not calculate like we do. In 1761, pi was proved irrational and since then, we have been trying to calculate it.
Pi was a very important discovery. While we do not use it in our daily lives, it appears in many of our everyday items. Pi defined which civilizations were primitive and which were more advanced.

UPDATE: Tomorrow's post: Math is Golden.