An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 309
Fig. Since the sphere is of unit radius, the measures of thearc txt2 of the great circle in which the plane txOt2 cutsthe sphere, and of the angle txOt2 are equal, and hence themeasure of the arc is Sxfr. Let Sa. measure the arc txt2 of Sa the indicatrix. Then Lt-s-r=+1- If we take the arcs 0\[s of…
Geometry, Analytic
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