Mathoma | Euclid's "Elements" - Book 1, Proposition 31 @Math_oma | Uploaded 3 years ago | Updated 1 hour ago
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Heath's translation of Euclid's "Elements"
http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0086%3Abook%3D1%3Atype%3DProp%3Anumber%3D31

This series is part of a larger project, part of which covers geometry.