An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 200
will be lost in the general result if we assume thatthe points Alt A2i A3 form an equi- A2lateral triangle and that A4 be itscenter, since by a collineation thisorthogonal quadrangle may be trans-formed into any other quadrangle.Let A 4 coincide with the origin, andAx with the X-axis, Fig. 77,… … Fig. 77. 188 PROJECTIVE GEOMETRY. so that the equation of the degenerate conic is (i) V3-lr2-\/3-^+2^-v/3-l:+^ = o. Similarly the equation of the degenerate conic represented byAtA3 and A 2B2 is (2) X/3Z2-V~3r)2-2ty-x/3-^-7} = o. The equations of the polars of the point P (x, y) with respectto…
Geometry, Projective · Geometry, Analytic
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