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 419
o project the vertex C, conceive the semi-circum-ference, of which A A is the projection, to revolveon AA until it falls upon the semi-circumferenceABA, then will the point C f\\ll at d. Hence makekd = b. In like manner revolving the semi-cir-cumference, of which AA is the projection, untilit falls… … Fig. 25. * In this treatise the discussions embrace only such triangles as have each part less than180°. t For the purposes for which we shall use these projections, an arc can be laid olT withsufficient accuracy by observing its relation to 90°, 60°, 30°, or some aliquot part of the…
Geometry · Trigonometry
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