A general geometry and calculus : including book I. of the general geometry, treating of loci in a plane; and an elementary course in the differential and integral calculus (1881)
Olney, Edward, 1827-1887 · New York : Sheldon and Co. · leaf 232
and 4/ is the parameterto the diameter A.2^2 Q. e. d. … Fig. 226. 34:0, CoR. 1.—The parameter to any diameter of a Parabola is fourtimes the distance from the vertex of that diameter to the directrix. 34:7* CoE. 2.—The double ordinate to any diameter of a Parabola,which {ordinate) passes through the focus, is the parameter to that dia-meter. Dem.—Let…
Geometry, Analytic · Calculus
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