Smart, Edward Howard · London : Macmillian and Co. · leaf 261
wherein Aand B coincide ultimately, as alsoD and E. The third diagonal isthe Pascal line, and the theoremfollows at once. ih) If a quadrilateral (4-side) becircumscribed to a conic, the linejoining the points jf contact ofopposite sides passes through theintersections of the diagonals. For consider… … Pig. llSa. Fig. USb. The above results establish the theorem found in § 13,Chap. VI., as extended to the conic in Chap. VIII. § 7. Note. In obtaining the intersections which give thePascal line or Brianchon point, it is sometimes a little puzzlingto a beginner in dealing with re-entrant hexagons to…
Geometry, Projective
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