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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

بحث عن الدائرة ومحيطها

"The History of the Solution of the Cubic Equation".

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Dragutin Svrtan and Darko Veljan, "Non-Euclidean versions of some classical triangle inequalities", Forum Geometricorum 12 2012 , 197—209
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Martin Celli, "A Proof of the Butterfly Theorem Using the Similarity Factor of the Two Wings", 16, 2016, 337—338
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An exploration of twenty key images, Mathematical Association of America, 2011, p
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حاسبة مساحة وقطر الدائرة أونلاين

"On the areas of cyclic and semicyclic polygons" PDF.

قانون مساحة الدائرة
Burago 2001 [1994], "Isoperimetric inequality", in Hazewinkel, Michiel ed
قانون مساحة نصف الدائرة
The Associated Harmonic Quadrilateral, Paris Pamfilos, Forum Geometricorum, Volume 14 2014 15—29
طريقة حساب مساحة الدائرة
"The History of the Solution of the Cubic Equation", Mathematics News Letter 5 4 , p