Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 147
ontained by the tangent and normal shall be twice the squareof the ordinate; and show the relation of such point to thefocus. 31. Find that point on a parabola for which the normal isequal to the difference between the subtangent and the sub-normal. 32. Having given the parabola if — 6a, find the… … Equations and Fundamental Properties. 116. Def. An ellipse is the locus of a point the sumof whose distances from two fixed points is constant. The two fixed points are called foci of the ellipse. Thus,if the point P move in such a way that PF-\- PF is con-stant, it will describe an ellipse. The…
Geometry, Analytic
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