اذا كانت الزاويتان متكاملتان فإنهما متجاورتان على مستقيم واحد | دائرة

Siehe Gericke: Antike und Orient	Smith, Geoff, and Leversha, Gerry, "Euler and triangle geometry", Mathematical Gazette 91, November 2007, 436—452
An exploration of twenty key images, Mathematical Association of America, 2011, p	Alsina, Claudi and Nelsen, Roger, Icons of Mathematics

دائرة

Nelson, Roger, "Euler's triangle inequality via proof without words," Mathematics Magazine 81 1 , February 2008, 58-61.

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دائرة: The Secrets of Triangles, Prometheus Books, 2012
دائرة: "The Evolution of the Isoperimetric Problem"
دائرة: Burago 2001 [1994], "Isoperimetric inequality", in Hazewinkel, Michiel ed

; Askey, Richard; Roy, Ranjan 1999	Courant and Robbins 1996, p
Todor Zaharinov, "The Simson triangle and its properties", Forum Geometricorum 17 2017 , 373--381	Advanced Euclidean Geometry: An Elementary treatise on the geometry of the Triangle and the Circle

دائرة

"The History of the Solution of the Cubic Equation", Mathematics News Letter 5 4 , p.

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دائرة: "Inversion in a Circle" and "Inversion of Lines and Circles
دائرة: Science in the Ancient World: An Encyclopedia
دائرة: Verlag Harri German, 5th edition, Thun and Frankfurt 2001, p