Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 75
Fio. 30. Draw PM and RN parallel to PQand RSrespectively.Then PQ is parallel to RS, PM „ „ RN, QM „ „ SN. Hence the triangles PQM and RSN are similar; . PQ _ PM~RS~R^N = ^RS 54 PROJECTIVE GEOMETRY Corollary I. A bisected line projects into abisected line, in orthogonal projection. Corollary II.… … B, p b; Fig. 31. Choose the plane ir so that the Hne of intersectionof ir and tt is parallel to the minor axis 6^6.2. Let the angle between tt and tt be d where cos V = -^— Then it is plain that CAi = CAi cos ^ = BiC = BlC.But by the properties of an ellipse, a^n~a^~a7c^ Also pn = pn AiC •(1) •(2)…
Geometry, Projective
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
