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If I understand your question, you are looking for equation of a circle, it's:
x^2 + y^2 = r^2 in most common form (0,0) being the center, r -radius.
Solving for y will give you +- value, since f(x) = x^2, f(x) >= 0 for all x.
If the center is shifted from the origin:
(x-a)^2 + (y-b)^2 = r^2
where a and b are (x,y) coordinates of the center of the circle, respectively.
ps: sorry there, firefox acting out on me
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got math? yumm...
"All men by nature desire to know" -Aristotle, Metaphysics
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