Higher geometry; an introduction to advanced methods in analytic geometry (1922)
Woods, Frederick S. (Frederick Shenstone), 1864- · Boston, New York, Ginn and Company · leaf 125
,are separated from each other by two lines PL and PK, which intersect LK on the conic; that is, atinfinity. These lines we call parallel lines, and say that through apoint not on a straight line can be drawn two lines parallel to thatstraight line. The angle which a line parallel to LK through P… … PEOJECTIVE MEASUREMENT 113 the conic as x?+x2~x£ = 0. The pole of LK is (1:0: 0). Theline PR is perpendicular to LK when it passes through the poleof LK. Its equation is therefore y3x2—y2xa= 0, and it intersectsLKmB(0:jfatVa). Hence, if p is the length of PR we have, from (5), ood^tt-tt , sinhf= ,…
Geometry, Analytic
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