Geodesic
Fuss formula
Matematičeskoe obrazovanie, no. 1 (2017), pp. 27-32 Cet article a éte moissonné depuis la source Math-Net.Ru

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The Fuss formula of the squared distance between the centers of inscribed and circumscribed circles of a quadrilateral is derived.
Keywords: Quadrilateral, inscribed circle, circumscribed circle, distance between centers, trapezoid, deltoid, academician Fuss. 
@article{MO_2017_1_a3,
     author = {V. B. Drozdov},
     title = {Fuss formula},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {27--32},
     year = {2017},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2017_1_a3/}
}
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V. B. Drozdov. Fuss formula. Matematičeskoe obrazovanie, no. 1 (2017), pp. 27-32. http://geodesic.mathdoc.fr/item/MO_2017_1_a3/