Geodesic
How the Center of Gravity of a Triangle differs from that of a Quadrilateral
Matematičeskoe obrazovanie, Tome 61 (2012) no. 1, pp. 10-19.

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

The positions of centers of gravity for triangles and quadrilaterals are defined, under the different mass distributions. 
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S. V. Dvoryaninov; S. Krauter. How the Center of Gravity of a Triangle differs from that of a Quadrilateral. Matematičeskoe obrazovanie, Tome 61 (2012) no. 1, pp. 10-19. http://geodesic.mathdoc.fr/item/MO_2012_61_1_a2/