This is "[o]ne of the oldest and most complete diagrams from Euclid's Elements of Geometry". It "is a fragment of papyrus of Oxyrhynchus in 1896-97 by the renowned expedition of B. P. Grenfell and A. S. Hunt. It is now located at the University of Pennsylvania. The diagram accompanies Proposition 5 of Book II of the Elements." -- Copied from http://www.math.ubc.ca/~cass/Euclid/papyrus/papyrus.html, where more information can be found.
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