Smart, Edward Howard · London : Macmillian and Co. · leaf 136
Tat … Fig. 53. Cor. 1. If LL be the portion of the tangent at P which isintercepted between TQ, TQ, then LP = PL. Cor. 2. The straight line midway between a point and itspolar with respect to a parabola touches the curve. § 12. Def. Conjugate lines through the centre of a conicare called conjugate…
Geometry, Projective
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