Smart, Edward Howard · London : Macmillian and Co. · leaf 196
aiG. 67a. cyclic, angle SYZ = angle STZ in Fig. 87b, but supplement ofangle STZ in Fig. 87a. .. angle STY = angle STZ in both cases. … 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,…
Geometry, Projective
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