اذا كانت الزاويتان متكاملتان فإنهما متجاورتان على مستقيم واحد

Altshiller-Court, Nathan, College Geometry, Dover, 2007	Michael Henle, "Modern Geometry: Non-Euclidean, Projective, and Discrete", 2nd edition, , 2001• , The Elements of Geometry, in Eight Books; or, First Step in Applied Logic London, Longmans, Green, Reader and Dyer, 1874 , p
— The Cosmos: A Historical Perspective 2006 — p	3 in Introduction to Geometry, 2nd ed

دائرة

Science in the Ancient World: An Encyclopedia.

12

دائرة: Translated from Postnikov's 1963 Russian book on
دائرة: Dragutin Svrtan and Darko Veljan, "Non-Euclidean versions of some classical triangle inequalities", Forum Geometricorum 12 2012 , 197—209
دائرة: Berlin, New York: DE GRUYTER

Washington, DC, USA: Mathematical Association of America	Siehe Gericke: Antike und Orient
The Secrets of Triangles, Prometheus Books, 2012	Smith, Geoff, and Leversha, Gerry, "Euler and triangle geometry", Mathematical Gazette 91, November 2007, 436—452

دائرة

Springer, Berlin Heidelberg New York 2007, , S.

21

دائرة: A Distorted View of Geometry
دائرة: Marie-Nicole Gras, "Distances between the circumcenter of the extouch triangle and the classical centers", Forum Geometricorum 14 2014 , 51-61
دائرة: See in particular the bottom of p

Geometry revisited, volume 19 ofNew MathematicalLibrary
1914 , page 193 via• Proceedings of the Royal Irish Academy	, "Some impossible constructions in elementary geometry", Mathematical Gazette 88, November 2004, 548—551

دائرة

Altshiller-Court, Nathan, College Geometry, Dover, 2007 orig.

دائرة: Nelson, Roger, "Euler's triangle inequality via proof without words," Mathematics Magazine 81 1 , February 2008, 58-61
دائرة: Martin Celli, "A Proof of the Butterfly Theorem Using the Similarity Factor of the Two Wings", 16, 2016, 337—338
دائرة: "The History of the Solution of the Cubic Equation", Mathematics News Letter 5 4 , p