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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 , see lulu dot com link from that page for GPL licensing
Author Original uploader was Bcrowell at en.wikipedia
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GNU head 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.
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