I've been taking Geometry and the year is ending. I have come to realize that it is centered around the Pythagorean theorem. Is it unique in this feature or will many classes be centered around this in the future? If so, what?
Edit: when I say 'centered' I really mean fundamentally connected to and 1-2 easy 'thought' steps away.
The people in the best position to answer your question are the math teachers at your school, so I'd encourage you to ask (one or more of) them.
Having said that, I don't think you'll see old Pythagoras much when you come to algebra and solving equations and solving systems of equation. He'll put in more of an appearance when you get to analytic geometry and Calculus, but that theorem won't be the be-all and end-all of those subjects.
And if you make it all the way to Category Theory, you can probably wave Pythagoras goodbye.