Geodesic
Hyperbolic parallelograms of the plane~$\widehat H$
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 43-52

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Hyperbolic parallelograms on a Hyperbolic Plane $\widehat H$ of the positive curvature in the Cayley–Klein model are investigated. We conducted their classification, obtained the metric correlations between the measure of angles and the expressions of lengths of the edges through a measure of included angles. 
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     author = {L. N. Romakina},
     title = {Hyperbolic parallelograms of the plane~$\widehat H$},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
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L. N. Romakina. Hyperbolic parallelograms of the plane~$\widehat H$. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 43-52. http://geodesic.mathdoc.fr/item/ISU_2013_13_3_a5/