Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 159
- c^ — b^, = d^x^ -2cx + a-, Art. 104 (1), = —X — a\a hence r = ex — a . . . (V) Similarly, we find r = ex -{- a . . . (2) 106. To construct the hyperbola having given the transverseaxis and the foci of the curve. … Fig. 48. First Method. — Let A A be the transverse axis and F, F, thefoci. Take a straisfht-edge ruler whose length is L and attach THE HYPERBOLA. 145 one of its ends at F so that the ruler can freely revolve aboutthat point. Cut a piece of cord so that its length shall be= L — 2 a, and attach one…
Geometry, Analytic
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