Verlag Harri German, 5th edition, Thun and Frankfurt 2001, p | Smith, Geoff, and Leversha, Gerry, "Euler and triangle geometry", Mathematical Gazette 91, November 2007, 436—452 |
---|---|
"The Evolution of the Isoperimetric Problem" | "Inversion in a Circle" and "Inversion of Lines and Circles |
Berlin, New York: DE GRUYTER | ; Askey, Richard; Roy, Ranjan 1999 |
---|---|
Springer, Berlin Heidelberg New York 2007, , S | Nelson, Roger, "Euler's triangle inequality via proof without words," Mathematics Magazine 81 1 , February 2008, 58-61 |
Advanced Euclidean Geometry: An Elementary treatise on the geometry of the Triangle and the Circle.
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