Dr. Kamlesh
                       BOOK: Differential Geometry and Tensor-1          Bisht
                        UNIT –VI : Envelope, Edge of Regression,     (Mathematics)
                      Ruled Surfaces, Developable surface, Tangent 
                                   to a Ruled Surface
                            DR. KAMLESH BISHT
                                  Academic Consultant
                              Department of Mathematics
                       UttarakhandOpen University, Haldwani
                                              Dr. KamleshBisht
                                               (Mathematics)
                          CCOONNTTEENNTT
                          CCOONNTTEENNTT
        
Objective.
        
Introduction.
        
Envelope.
        
Ruled surface.
        
Summary.
        
References.
                                    Dr. KamleshBisht
                                     (Mathematics)
                 OOBBJJEECCTTIIVVEESS
                 OOBBJJEECCTTIIVVEESS
      After studying this unit, you should be able to know 
        about-
      
Characteristics, envelope and edge of regression of 
        family of surfaces .
      
Ruled surfaces, their classification and associated 
        properties. 
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