Smart, Edward Howard · London : Macmillian and Co. · leaf 137
J = \JQ! and RU = UR. CX and CY beingconjugate lines at the centre are conjugate diameters. … Y a/oo Fia, 54. Cor. Any chord of a conic and the join of its middlepoint to the centre determine the directions of a pair ofconjugate diameters. Ex. Draw the figures for the cases in which the vanishing line cuts,and touches, the circle. § 13. Since an infinite number of pairs of conjugate…
Geometry, Projective
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