Smart, Edward Howard · London : Macmillian and Co. · leaf 277
.: by § 5, Chap. XIVtangent to the curve. /is § 3. Pascals and Brianchons theorems may also be usedfor these problems as follows : Given five points A, B, C, D, Eon a conic to determine the re-maining point in whicli the conicmeets any line through A. Given five tangents a, h, c, d, eto a conic to… … Let AF (Fig. 126a) be any linethrough A, and let F he the point tobe found where the conic cuts AF. Take any point on a (Fig. 126ft),and let / be the tangent to bedrawn from it to the conic. 250 PROJECTIVE GEOMETRY The Pascal line for ABCDEF isthe join of the intersections of ABand DE, and CD and…
Geometry, Projective
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