Spherical Trigonometry, for the Use of Colleges and Schools: With Numerous Examples

ambiguity angular approximately arcs base calculated called centre Chapter circular cloth considered constant corresponding cos a cos cosc cosines deduce demonstrated denote described determine distance draw drawn edges Edition elements equal equation error example expression faces figure fixed points formed formulæ four give given greater Hence inscribed known length less measured meet method middle point Napier's observed obtain opposite sides perpendicular plane polar triangle pole polygon position preceding Article produced quadrant radius regular polyhedron relation remain respectively result right angles right-angled triangles Rules shew shewn sides Similarly sin b sin sine sinº small circle solid angles solution sphere spherical excess spherical triangle straight lines supplement suppose surface tetrahedron theorem third touches triangle ABC true volume