Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 67
s perpendicular to Bc.So OB is perpendicular to Ca. Hence O is theorthocentre of the triangle ABC. Thus OC is per-pendicular to Ab, whence the Polar Line of C is 46 PROJECTIVE GEOMETRY parallel to AB. Consequently N lies on the Line atInfinity LM. .. L, M, N are collinear. Important Type of… … Fig. 22 Let LPM be an angle. Let U and V be two points on PH^, and PK,^respectively.
Geometry, Projective
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