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Heavenly mathematics
Exploring the sphere
The ancient approach
The medieval approach
The modern approach: right-angled triangles
The modern approach: oblique triangles
Areas, angles, and polyhedra
Stereographic projection
Navigation.
Exploring the sphere
The ancient approach
The medieval approach
The modern approach: right-angled triangles
The modern approach: oblique triangles
Areas, angles, and polyhedra
Stereographic projection
Navigation.