Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 193
ollows that every point of the parabola is equally distantfrom the focus and tlie directrix. From this fact we derivethe two following methods of construction : (1) By compasses. Let F (Fig. 77) be the focus and DD and FX be the directrixand the axis, respectively, of the parabola to be… … Fig. 77. centre and a radius equal to the distance from DD to ABdescribe an arc of a circle. This arc will intersect AB at twopoints P and P, which will be points of the parabola. Proceeding in this way we may determine as many jointsof the curve as we wish. (2) By a mechanical device. As before, F…
Geometry, Analytic
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