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 229
■= 2px. Dividing, —- = -^. q. e. d, 334:, CoK.—All chords drawn parallel to atangent at the extremity of a diameter of a par- ^ig 222 abola are bisected by that diameter. 335. ScH.—Having the curve to find the axis and focus of a parabola,we draw any pair of parallel chords, and bisect tliem by a… … (d) ECCENTEIC ANGLE. 336, Def.—The JEccentric Angle in an ellipse is the angleformed with the axis of abscissas by a line drawn from the centre toa point in the circumference of the circumscribed circle where a pro-duced ordinate meets it, that is PA B Fig. 219. 337. I*rop.—The abscissa of any…
Geometry, Analytic · Calculus
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