Smart, Edward Howard · London : Macmillian and Co. · leaf 276
Fig. 125a. … THE CONSTRUCTION OF A CONIC 249 Thus, for every straight line wedraw through O, we obtain a freslipoint on the curve. The principle of the constructionis that homographic pencils atvertices B and C are completelydeterminable when two triads ofcorresponding rajs BA, BD, BEand CA. CD, CE are known.…
Geometry, Projective
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