Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 79
70 ANALYTICAL GEOMETRY. … isosceles triangle, it is therefore perpendicular to that base.Hence, we have this general truth. If from the focus of a parabola a perpendicular he drawn to anytangeni, it will meet the tangent on the axis of Y. Also, from the two similar right angled triangles, we have TF \ FB .. FB \ FV.…
Geometry, Analytic · Calculus
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