Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 100
y, or changing the sign ofthe second member, or both in (3), we have y^ = ~ 2px for the equation of a parabola symmetricalwith respect to X and extending to the left of Y; cc^ = 2 py for the equation of a parabola symmetrical withrespect to Y and extending above X. £c^ = — 2py for the equation of a… … Fig. 30. First Method. — Let DR be the directrix and let F be thefocus. From F let fall the perpendicular FD on the directrix; itwill be the axis of the curve. Take a triangular ruler ADCand make its base and altitude coincide with the axis anddirectrix, respectively. Attach one end of a string,…
Geometry, Analytic
Internet Archive · Boston College Libraries · Public Domain Mark 1.0. Free to use for anything.
