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           | Description | 
           a proof from  en:Euclid's  Elements (Book I, Proposition I) english translation available here:  S:Page:The_Elements_of_Euclid_for_the_Use_of_Schools_and_Colleges_-_1872.djvu/31 | 
          
          
           | Date | 
           2006-03-04 (first version); 2006-03-04 (last version) | 
          
          
           | Source | 
            http://farside.ph.utexas.edu/euclid.html , see lulu dot com link from that page for GPL licensing | 
          
          
           | Author | 
           Original uploader was  Bcrowell at  en.wikipedia | 
          
          
           Permission ( Reusing this file) | 
           
             NORIGHTSRESERVED. 
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          This work is  free software; you can redistribute it and/or modify it under the terms of the  GNU General Public License as published by the  Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See  version 2 and  version 3 of the GNU General Public License for more details.http://www.gnu.org/licenses/gpl.htmlGPLGNU General Public Licensetruetrue | 
         
        
        
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