A first course in projective geometry . Fig. 876. TANGENT AND NORMAL PROPERTIES 169 Note 1. The proof applies equally when the tangents bothtouch the same branch of the hyperbola. Note 2. § 2 is the particular case of this theorem when Tis on the curve. Ex. What does this property become for the parabola ? § 6. Prop. In a central conic, if N, G be the feet of theordinate and normal at P respectively, and C be the centre, {a) CG = e2CN. {h) PG is inversely proportional to the central perpendicularon the tangent. Let the tangent at P meet the axis in T (Figs. 88a and 6),.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeometryprojective