Quadric surfaces

By Andy Douglas on Wednesday, May 3, 2000 - 09:25 pm :

could someone tell me what a quadric surface is?

By Dan Goodman (Dfmg2) on Friday, May 5, 2000 - 09:40 pm :

According to the entry in MathWorld a quadric is a surface defined by an equation like:

$x^{2} / (a^{2} + θ) + y^{2} / (b^{2} + θ) + z^{2} / (c^{2} + θ) = 1$

They are a particular sort of quadratic surface.

By The Editor :