Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 56
finity in tworeal points is called a Hyperbola.(2^) A Real Conic which cuts the Line at Infinity in twocoincident points is called a Parabola. <^o> 16. Projective Aspect of a Focus. The following is an elementary geometrical propertyof the conic :— THE CONIC 35 Let PSQ be a focal chord. Let… … Fio. IS. By Chap. 11. Art. 1, the tangents from S to theconic harmonically separate all pairs of ConjugateLines drawn from S. Hence, to find the tangentsfrom S to the conic, we draw two pairs of ConjugateLines from S, viz. SP^, SZj and SPg, SZg, and then findthe pair of lines that harmonically…
Geometry, Projective
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
