I haven't done any math in at least 5 years, so please be gentle :D
I have this intuition that if I took a circle of infinite radius, any finite length segment taken from it would be a straight line segment.
I know that a general circle equation in 2d x-y coords is x^2 + y^2 = r^2, but I'm having some troubles coming up with more ideas, because if I use this equation, quite a few things turn infinite, and are freaking me out.
Any clues would be welcome.
P.S. This is not homework, I'm too old for that, and out of school... this is just a random hobby question. Thanks. Please don't down vote! :D