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 119
Second, when both sides are chords and the centre of ih£circle lies between them. Let APB be such an angle.Draw the diameter PC. Now, by the preceding part,APC is measured by-^AC, and CPB by iCB. HenceAPC + CPB, or APB, is measured by ^AC + iCB, oriAB. Q. E. D. ^ Third, when both sides are cliords…
Geometry · Trigonometry
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