A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 237
ral, is also right. 560* Cor. 2.—A spherical angle is meas-ured by the arc ofja great circle interceptedheticeen its sides, and at a quadrayifs dis-tance from its vertex. Thus, the spherical angle CPA is measured by CA, PC and PA being quad-rants. For, since PC is a quadrant, CG is perpendicular to… … SPHERICAL ANGLES. \l 217 S61* Cor. 3.—The angle included by two arcs of ^nqjl circles isI the same as the angle included by two arcs of great circles passing\i through the vertex and having the same tangents. Thus BAC = BAC. For the angle BAC is, bydefinition, the same as BAC, BA and CA…
Geometry · Trigonometry
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