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 254
hose angle is AEB. For, let tlie semicircumferences CEB and DEArbe produced around the sphere, intersecting onthe opposite hemisphere, at the extremity F otthe diameter through E. Now, FBEA is a lunewhose angle is AEB. Moreover, the triangle AFBis equivalent to the triangle DEC: since angle ^ig… … 234 ELEMENTARY SOLID GEOMETRY.
Geometry · Trigonometry
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