гиперболическая плоскость H положительной кривизны; параллелограмм; гиперболический параллелограмм.

Hyperbolic Parallelograms of the Plane b H

Hyperbolic parallelograms on a Hyperbolic Plane b 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.