Law of sines at the hyperbolic triangle

Description

A hyperbolic triangle is a triangle in the hyperbolic plane. It consists of three line segments called sides or edges and three points called angles or vertices.The relations among the angles and sides are analogous to those of spherical trigonometry. In hyperbolic geometry when the curvature is −1, the law of sines relates the sines of the angles and the hyperbolic function sinh of the sides.