Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 193
9) the equationof the tangent is obtained from the equation of the curv^e,y~ z= 4 ax, by replacing t/^ by y y% 2 x by x + X. The segment TP (Fig. 70) of the tangent from its intersec-tion T with the axis of theparabola to the point of contactP is called the length of thetangent at P; the projection… … IX, § 188] THE PARABOLA 181 construction for the tangent at any point P of the parabola itthe axis and vertex of the paraboha are known. 187. Equation of the Normal. The normal at a point Pof any plane curve is delined as the perpendicular to the tan-gent through the point of contact. The slope of…
Geometry, Analytic
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