Smart, Edward Howard · London : Macmillian and Co. · leaf 139
nto a pair of rectangular con-jugate diameters for the conic. Moreover, this construction is unique, for only one circlecan be drawn through V having its centre on XY and cuttingthe given circle orthogonally. Hence only one pair of rect-angular conjugate diameters exists. GENERAL FEATURES OF CONICS…
Geometry, Projective
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