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 46
way around, as to FO, two rightangles ; when entirely around, four right angles. ^ Now, if any circle be described from 0 as a cen-tre, the arc included by the sides of any angle havingits vertex at 0, is (he same part of a quarter of thiscircumference as the angle is of a right angle. Hencethe… … Fig. 36. 61. Tlieof^em,—The relative lengths of arcs described luith thesame radius can he found in a manner altogether similar to thatgive?i in {36) for comparing straight lines. III.—If I wish tp compare the two arcs db and cd described with tlie samarfidii, I take the dividers, and placing the…
Geometry · Trigonometry
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