Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 108
Fig. 30. Description of Original Figure.The join of the two ^points A, B cids the conic S intwo points P, Q that harmonically separate A, B. Dual (or Reciprocal) Figure. The intersection of the two lines a, h lies on twotangents p, q that harmonically separate a\ h. … Fio. 40. Example 4. Prove that the polars of the point pq with respect 88 PROJECTIVE GEOMETRY to all conies touching the four fixed lines jp, q, r, spass through a fixed point. The Dual Theorem is easier to prove, viz.: Prove that the poles of the line PQ with respect to all conies passing through…
Geometry, Projective
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