Geodesic
An interesting property of a triangle
Matematičeskoe obrazovanie, no. 1 (2021), pp. 13-16 Cet article a éte moissonné depuis la source Math-Net.Ru

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On connection of two properties of a triangle: “the incenter is equidistant from the orthocenter and the center of the circumscribed circle” and “the angles of the triangle form an arithmetic progression”. 
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     author = {V. B. Drozdov},
     title = {An interesting property of a triangle},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {13--16},
     year = {2021},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2021_1_a2/}
}
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V. B. Drozdov. An interesting property of a triangle. Matematičeskoe obrazovanie, no. 1 (2021), pp. 13-16. http://geodesic.mathdoc.fr/item/MO_2021_1_a2/