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Non-Euclidean geometry

Elliptic geometry
Non-Euclidean geometry
Hyperbolic angle
Argument of the hyperbolic functions
Hyperbolic geometry
Non-Euclidean geometry
Hyperbolic triangle
Triangle in the hyperbolic plane, possibly having ideal vertices
Non-Euclidean geometry
Two geometries based on axioms closely related to those specifying Euclidean geometry
Spherical geometry
Geometry of a sphere