"The Evolution of the Isoperimetric Problem" | , : A History of Man's Changing Vision of the Universe 1959• Altshiller-Court, Nathan, College Geometry, Dover, 2007 orig |
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Altshiller-Court, Nathan, College Geometry, Dover, 2007 | Nelson, Roger, "Euler's triangle inequality via proof without words," Mathematics Magazine 81 1 , February 2008, 58-61 |
Washington, DC, USA: Mathematical Association of America | Michael Henle, "Modern Geometry: Non-Euclidean, Projective, and Discrete", 2nd edition, , 2001• Novi Commentarii academiae scientarum imperialis Petropolitanae |
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"On the Equations and Properties: 1 of the System of Circles Touching Three Circles in a Plane; 2 of the System of Spheres Touching Four Spheres in Space; 3 of the System of Circles Touching Three Circles on a Sphere; 4 of the System of Conics Inscribed to a Conic, and Touching Three Inscribed Conics in a Plane" | Springer, Berlin Heidelberg New York 2007, , S |
"On the areas of cyclic and semicyclic polygons" PDF.