Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 117
ponding value of y, will be the ordinate through the focus. Under this supposition,we have, y2 = 2p X I = jp2; or, y = p. Hence, 2p = the parameter. 2. In the ellipse, the parameter of the transverse axisis ar third proportional to the axes (Bk. m.. Art. 11); inthe parabola, it is a third… … we have a simple construction for detennining points ofthe curve. Let ^JT, AYj be the co-or-dinate axes. The equation ofthe curve is, From the origin A, lay offa distance AB, on the nega-tive side of abscissas, equal to2p. Then, from A, lay off any distance, as AP, and drawPM perpendicular to AJi.…
Geometry, Analytic · Calculus
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