Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 38
Fig. 12. Then, since A is at infinity, Pq is parallel to SR.Similarly, Qr „ „ „ PS Hence, PQRs is a parallelogram. THE STRAIGHT LINE 17 ^ The Harmonic Properties of tlie Complete Quad-rano^le can now be read off from Fig. 12, and we sliallquote a few by way of illustration. 1°. Let in the original… … Fig. 13. But a transversal across the pencil A[pBSC] isLBMC. .-. A[PBSC] = A[PBSC]= [LBMC] = ^ (since C is at infinity), = -1 .-. A[PBSC] is harmonic (Chap. I. Art. 6). 15. The Complete Quadrilateral. If p, q, r, s be fourgiven lines, and if a be the line joining pq and rs; b the linejoining pr and…
Geometry, Projective
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