Quadric surfaces?

  • Thread starter qqchico
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  • #1
qqchico
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why are they called quadric surfaces?
 

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  • #2
CinderBlockFist
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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.
 
  • #3
qqchico
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I have that too but i don't think the teacher would give such an easy question. thanks a bunch.
 
  • #4
HallsofIvy
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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.
 

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