Geodesic
Five circles
Matematičeskoe obrazovanie, Tome 72 (2014) no. 4, pp. 2-5.

Voir la notice de l'article provenant de la source Math-Net.Ru

Relations between radii of inscribed circle, circumscribed circle, three excircles, and other elements of a triangle are presented.
Keywords: the inscribed circle, circumscribed circle, excircles. 
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     author = {V. Drozdov},
     title = {Five circles},
     journal = {Matemati\v{c}eskoe obrazovanie},
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     number = {4},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2014_72_4_a0/}
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V. Drozdov. Five circles. Matematičeskoe obrazovanie, Tome 72 (2014) no. 4, pp. 2-5. http://geodesic.mathdoc.fr/item/MO_2014_72_4_a0/