Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 57
and SPg, SZg, and then findthe pair of lines that harmonically separate SPj, SZjand SPo, SZ., by the method of Chap. II. Art. 4. But when S is a focus, SP^, SZ^ and SPg, SZ^ areperpendicular pairs, and the pair of lines harmonicallyseparating each of tliem is SI SJ. Hence the tangents from the… … Fic. 19. tangents from J in the four points S^, S2, S3, S^, whichwill therefore be the four foci of the conic.18. Projective Aspect of two Equal Angles. Let LPM and LQM be twoequal angles. Then the four points LPQMare concyclic. Hence we may regard thepoints P, Q, L, M and theCircular Points I and…
Geometry, Projective
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