Why are they called quadric surfaces?

qqchico · Sep 21, 2005

why are they called quadric surfaces?

CinderBlockFist · Sep 21, 2005

well the definition in my book gives:

Q quadric surface is the graph of a second-degree equation in three variables x, y, and z. So i guess cause its the graph of a quadratic equation in 3-D.

qqchico · Sep 23, 2005

I have that too but i don't think the teacher would give such an easy question. thanks a bunch.

HallsofIvy · Sep 23, 2005

Why are "quadratic equation" called "quadratic" when "quad" means 4?

Apparently because a square has 4 sides!

Extends, then to "quadric" surfaces, surfaces whose equations involve 2 nd power.

Why are they called quadric surfaces?

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Why are they called quadric surfaces?

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