ectrix andfocus are supposed to be given, i.p., the distance {ZF= 2a)of the focus from the directrix. This distance is thequantity wliich individualizes the curve, or distinguishesit from otlier parabohis. Thus a is a known quantity,just as r, the radius of the circle, is a known quantityin the… … (2). y^ = 4:ax. Since y^ is always positive, thereforeX is always positive, a being supposed positive. Hencethe curve does not exist to the left of the origin A. The Pakabola. 109 (3). 2/ = ±2 J ax. Therefore for a given value of x,the values of y are equal with opposite signs. Hencethe curve is…
Geometry, Analytic
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