Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 27
o pencils of rays in which /_AOB = l. AOB; Z.COD = _C0D; ^AOD = ^A0D; z. COB = z.G0B; then it isplain from last paragraph that the cross-ratio 0[ABCD] = the cross-ratio 0[ABCD].(^) Harmonic Division. The two points P and Q are saidto harmonically separate R and S if A Q Fi(3. 5. _ PR PSRQ^SQ^ i.e.… … Fig. 6. Let O be the vertex of projection and I a line lyingin the plane tt. Let a plane A passing through O andI cut the plane tt in the hne T. Let A, B, C, D be thefour points on r that are respectively the projectionsof the four points A, B, C, D lying on I (Chap. LArt. 5). Then by Chap. I. Art…
Geometry, Projective
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