Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 158
anexterior point to any conic subtend equal angles at the focus. 14. In the parabola the perpendicular from the focus onany tangent meets it on the tangent at the vertex; the per-pendicular meets the directrix on the line through the pointparallel to the axis of the parabola. The equation of… … Fig. 75. They therefore meet on the l^-axis, which is the tan-gent at the vertex. Let the student prove the second part of the theorem. 140 ANALYTIC GEOMETRY [Ch. X, § 78 15. Show that theorem 14 does not hold for centralconies, but that the perpendiculars from the foci of a cen-tral conic on any…
Geometry, Analytic
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