Smart, Edward Howard · London : Macmillian and Co. · leaf 173
Fig. 75. Theorem. If through any point S on an axis of a conictwo pairs of perpendicular conjugate lines can be drawn, Smust be a fixed point, and every pair of conjugate linesthrough it will be perpendicular. For, taking S on the major or transverse axis (Fig. 75), PN_lO< ^1 PNKXNA ~ XA ^*^ AN…
Geometry, Projective
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