Geodesic
Karl Feuerbach a jeho věta o dotyku kružnic
Učitel matematiky, Tome 23 (2015) no. 2, pp. 79-90 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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The text is about Karl Feuerbach and his remarkable theorems. First, we describe his life and the path to mathematics. Then we remember the ``small'' Feuerbach's theorem about nine points circle, with brief proof. Finally, we state the ``big'' Feuerbach's theorem about tangent circlec, and two the most interesting proofs.
The text is about Karl Feuerbach and his remarkable theorems. First, we describe his life and the path to mathematics. Then we remember the ``small'' Feuerbach's theorem about nine points circle, with brief proof. Finally, we state the ``big'' Feuerbach's theorem about tangent circlec, and two the most interesting proofs. 
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Lorencová, Tamara. Karl Feuerbach a jeho věta o dotyku kružnic. Učitel matematiky, Tome 23 (2015) no. 2, pp. 79-90. http://geodesic.mathdoc.fr/item/UM_2015_23_2_a1/

[1] Ayme, J. L.: Feuerbach's Theorem a new purely synthetic proof. 2010, překlad: Rosado, F. B., internetový zdroj: http://jl.ayme.pagesperso-orange.fr/Docs/Feuerbach1.pdf

[2] Grinberg, D.: Karl Wilhelm Feuerbach, sein Kreis und die Dreiecksgeometrie. internetový zdroj: http://www.matheraetsel.de/texte/Feuerbach.pdf

[3] Pedoe, D.: Circles: a mathematical view. The Mathematical Association of America. 1995. | MR

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