Algebraic surfaces of the 2nd degree – Quadric surfaces
Algebraic surface of the 2nd order has class equal to 2 - it is a surface of 
the 2nd degree and it is given by a 2nd degree algebraic equation \( F^2(x,y,z)=0\) 
. Such surfaces are called the quadrics. (Wikipedia: Quadrics)
There are 5 types of quadrics:
 ELLIPSOIDS
 
HYPERBOLOIDS
   PARABOLOIDS
  CONES  
 CYLINDERS 
Created by Sonja Gorjanc, translated by Helena Halas and Iva Kodrnja - 3DGeomTeh - Developing project of the University of Zagreb