Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 128
Fig. 75 Fig. 76 The sides of a spherical triangle are arcs of great circles.Thus, AB (Fig. 76) is an arc of a great circle. The sides of aspherical triangle are measured in degrees, minutes, and sec-onds, and therefore by the plane angles formed by radii of 139 fc 140 SPHERICAL TRIGONOMETRY the…
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