How do you offset a circle from the origin in polar coordinates or a sphere from the origin in spherical?
In other words, is there any way to restate a general rectangular formula for a circle:
(x-a)^2 + (y-b)^2 = c^2
In polar coordinates? How about:
(x-a)^2 + (y-b)^2 + (z-c)^2 =...