Geodesic
On the area of a~trihedral on a~hyperbolic plane of positive curvature
Matematičeskie trudy, Tome 17 (2014) no. 2, pp. 184-206.

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We prove a formula for the area of a trihedral on a hyperbolic plane $\widehat H$ of positive curvature via the angles at its vertices. 
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L. N. Romakina. On the area of a~trihedral on a~hyperbolic plane of positive curvature. Matematičeskie trudy, Tome 17 (2014) no. 2, pp. 184-206. http://geodesic.mathdoc.fr/item/MT_2014_17_2_a9/

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