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 236
thegreatest, on the arc of any great ciicle of the S2)here. Thus PD and PmD are two perpendiculars from P upon the circumferenceADBC. SPHERICAL ANGLES. S36, The angle formed by two arcs of_Jfcircles of a sphere is conceived as the sameas the angle included by the tangents tothe arcs at the common… … Fig. 330. 216 ELEMENTARY SOLED GEOMETRY.
Geometry · Trigonometry
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