Smart, Edward Howard · London : Macmillian and Co. · leaf 244
where PPj, PP/; QQj,QQj are drawn parallel to the asymptotes Cx, Coo. . P/C^_Q/co_ P^oo. QjCP/oo. QjC ~ PjCTq^oo ■ 216 PROJECTIVE GEOMETRY whence ihe result required easily follows. … Fig. 109. III. As illustrating theorem (b) of § 2, we may deduce auseful property of tangents to a parabola. Since the parabola touches the line at infinity, we may takethis line as one of the fixed tangents. If any variable tangentcuts three other fixed tangents at H, K, L, then {HKLoo} is HK…
Geometry, Projective
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