| . Spherical Geometry-Definitions. H2G2. BBC. 23 April 2008. . Menelaus of Alexandria. Technology Museum of the Thessaloniki. 23 April 2008. . O'Connor, JJ, and Robertson, EF. Non-Euclidean Geometry. The MacTutor History of Mathematics archive. Feb. 1996. University of St. Andrews, Scotland. 23 April 2008 . Menelaus Theorem. 24 April 2008 . Veljan, Darko. The 2500-Year-Old Pythagorean Theorem. Mathematics Magazine. 73.4 (Oct., 2000): 259-72. Jstor. 24 April 2008 * B* ph    h   j    h  UhDg hu ]hDg h] PJ ]nHtH /  4  5   < |  
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