Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 149
i draivn to the points of contact of the tangents. In Fig. 83, let B and D bethe points of contact of tangentsfrom Q, F being a focus. Drawthe line BD and let it meet thedirectrix corresponding to F inA, and the line QF in C. Drawthe lines BE and DG perpen-dicular to the directrix. SinceF is the… … Fig. 83 ABBC EBAB BFEB AD CD GDAD DFGD (Similar triangles), (Eccentricity, property A, Art. 94). Equating the product of the right-hand members of these equa-tions to the product of their left-hand members, we obtain BF^DFBC CD Hence the point C divides the side BD of the triangle BFD inthe ratio…
Geometry, Analytic
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