Geodesic
Five circles
Matematičeskoe obrazovanie, no. 4 (2014), pp. 2-5
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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},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2014_4_a0/}
}
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V. Drozdov. Five circles. Matematičeskoe obrazovanie, no. 4 (2014), pp. 2-5. http://geodesic.mathdoc.fr/item/MO_2014_4_a0/