creation of polygons from points
    Alejandro Hinojosa Corona 
    alhinc at cicese.mx
       
    Wed Sep 27 14:30:13 EDT 1995
    
    
  
You could try v.cicle, here is a piece of the man page:
     v.circle - Creates one or more "polygon" circles in a binary
     vector file.  These circles are created using each point
     from an existing "site_lists" file as the centers for those
     circles.  There is one circle created per "site_lists"
     point.
     (GRASS Vector Program)
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Alejandro Hinojosa
Research Associate
Earth Sciences Division
CICESE (Centro de Investigacion Cientifica y Educacion Superior de Ensenada)
Ensenada, Baja California, Mexico.
Mailing address: P.O. Box 434843
                 San Diego Ca. 92143-4843
voice; (01152)6174-4501 to 08 fax:(01152)6174-4933
email: alhinc at cicese.mx  (158.97.1.33)
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