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 138
, asBC, equal to OB, the radius. In the triangle BOC the angle O is measured bythe arc BC, or i of a circumfejence, and hence is \of 4 right angles, or | of a right angle. Angle ABCis measured by ^ arc CDEFA, or f of a circumfer-ence. Hence angle OBC, which is ^ of ABC, ismeasured by ^ of f, or |… … 272. A Broken Line is said to be Convex when no one of itsparts will, when produced, enter the space included between it anda line joining its extremities. PROPOSITION xxin. 273. Theorekn.—A Convex broken line is less than any brokenline luhich envelops it and has the same extremities. Dem.—Let…
Geometry · Trigonometry
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