Smart, Edward Howard · London : Macmillian and Co. · leaf 89
Fig. 28. CO is a fixed straight line. Let the tangents at the endsof any chord QOQ through O meet in T. 62 PROJECTIVE GEOMETRY Draw TN perpendicular to CO. We shall prove that CN isconstant. The locus of T will then be the fixed straight lineNT. Join CT, cutting QQ in V. Then, since QV is…
Geometry, Projective
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