Geodesic
Reference Problems and Theorems for Computing of Areas of Triangles and Quadrangles
Matematičeskoe obrazovanie, Tome 50 (2009) no. 2, pp. 31-40.

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

Computing of areas is based on a number of reference facts which are considered in the paper. Every reference problem or theorem is illustrated with an example. 
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     author = {E. Potoskuev},
     title = {Reference {Problems} and {Theorems} for {Computing} of {Areas} of {Triangles} and {Quadrangles}},
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E. Potoskuev. Reference Problems and Theorems for Computing of Areas of Triangles and Quadrangles. Matematičeskoe obrazovanie, Tome 50 (2009) no. 2, pp. 31-40. http://geodesic.mathdoc.fr/item/MO_2009_50_2_a4/