Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 72
Fig. 27. Generalisation. If a conic be inscribed to the triangle SI J, and if Pbe a point on the Polar Line of S, then the tangentsfrom P to the conic harmonically separate PI a7id PJ. 26. It will not be found most convenient in all casesto project the given fig-ure so that the conic in-volved… … 52 PROJECTIVE GEOMETRY Drop a perpendicular PP from P on to it. P is called the orthogonal projection of P on theplane it {it and it being always supposed not perpen-dicular). 28. The orthogonal ^projection of a straight line is a straight line. Let ^ be a straightline lying in it. Drop the…
Geometry, Projective
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