, Advanced Euclidean Geometry, Dover Publ | adsbygoogle []; if typeof adsbygoogle |
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Nelson, Roger, "Euler's triangle inequality via proof without words," Mathematics Magazine 81 1 , February 2008, 58-61 | 10 in Modern Geometry: The Straight Line and Circle |
Courant and Robbins 1996, p | Alsina, Claudi and Nelsen, Roger, Icons of Mathematics |
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3 in Introduction to Geometry, 2nd ed | Michael Henle, "Modern Geometry: Non-Euclidean, Projective, and Discrete", 2nd edition, , 2001• "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" |
, "Some impossible constructions in elementary geometry", Mathematical Gazette 88, November 2004, 548—551 | Marie-Nicole Gras, "Distances between the circumcenter of the extouch triangle and the classical centers", Forum Geometricorum 14 2014 , 51-61 |
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"Inversion in a Circle" and "Inversion of Lines and Circles | in modern notation, with introductory chapters |