Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 126
125 Let 6^ be a given point,through which a tangent is to bedrawn. With (r, as a centre, and a radiusequal to GF^ the distance to thefocus, describe the arc of a circleintersecting the directrix at C andC. Through C and C\ draw twolines parallel to the axis BX^ inter-secting the parabola in F and…
Geometry, Analytic · Calculus
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