Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 129
directrix RR: the path of P will be aparabola. For in every position we shall have PF=PD, wiiich agrees with the definition. 98. Problem. To find the equation of tlie parabola. Let i^ be the focus, and YY the directrix. Through i^draw OX perpendicular to YY, Take y0 as the origin, OF as the axis of…
Geometry, Analytic
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