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 423
cnuse, belong to a treatise on Conic Sections. In this case, BB and 20 P are the axes of theellipse, and the curve can be constructed by takin<? BP as a radius, and strikinor arcs from 0as a centre, cutting BB- These intersections are the foci of the required ellipse. Then takea string equal in… … Fig. 32. aic BOB; hence, it must be at the intersectionsC, C Drawing the projections of the perpendic-ulars CA, and CA, the projection is complete. Queries.—When will there be two trianglesfulfilling the given conditions ? When but one ?When none ? When there is but one triangle whatkind of a…
Geometry · Trigonometry
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