
 Conic Sections  Search Results  MSN Encarta 
  Conic Sections, in geometry, twodimensional curves produced by slicing a plane through a threedimensional right circular conical surface. 
  Conic sections, a commonly studied topic of geometry, are twodimensional curves created by slicing a plane through a threedimensional hollow cone. 
  main article, circles as conic sections, conic projection, description, ellipses as conic sections, focus, hyperbolas as conic sections, parabolas... 
 encarta.msn.com /Conic_Sections.html (150 words) 
