Hyperbolic angle

Argument of the hyperbolic functions

In geometry, hyperbolic angle is a real number determined by the area of the corresponding hyperbolic sector of xy = 1 in Quadrant I of the Cartesian plane. Hyperbolic angle is a shuffled form of natural logarithm as they both are defined as an area against hyperbola xy = 1, and they both are preserved by squeeze mappings since those mappings preserve area. The hyperbola xy = 1 is rectangular with semi-major axis 2 {\displaystyle {\sqrt {2}}} , analogous to the circular angle equaling the area of a circular sector in a circle with radius 2 {\displaystyle {\sqrt {2}}} .

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