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 122
it measured byi {arc CmD — arc C?iD), ^. <?., one-half the differ-ence of the intercepted arcs. For, through one ofthe points of tangency, as C, draw a chord, as CE,parallel to the other tangent. Now, ACE ismeasured by i arc CE, by the last proposition.But ACE = APB, and arc CE = CmD — D??iE… … Fio. 162. EXERCISES. 1. JProb,—TJirough a given point to draio a parallel to a givenline, on the principles contained in (149), (201), and (1(>5). Solution.—Through P to draw a parallel to AB. Fiom P as a centre, withany radius greater than the distancefrom P to AB, describe an arc cut- . ting…
Geometry · Trigonometry
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