1. Sep 21, 2005 #1

   qqchico

   

   why are they called quadric surfaces?

    

   qqchico, Sep 21, 2005
2. 
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3. Sep 21, 2005 #2

   CinderBlockFist

   

   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.

    

   CinderBlockFist, Sep 21, 2005
4. Sep 23, 2005 #3

   qqchico

   

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

    

   qqchico, Sep 23, 2005
5. Sep 23, 2005 #4

   HallsofIvy

   

   Science Advisor

   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.

    

   HallsofIvy, Sep 23, 2005

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