In writing this book, covering Euclid and Geometric cones, it is assumed the reader has passed through the ordinary curriculum in Geometry. No rigid notation is followed but points have been denoted by A, B, C, ..., lines by a, b, c ...., and planes and conics by a,b,g .... . ?r.h? has been used for rectangular hyperbola. Director has been used to include the ?director circle? of a central conic and the ?directrix? of a parabola. The length of the perpendicular from the point A on the line b has been denoted by (A, b).

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