A general geometry and calculus : including book I. of the general geometry, treating of loci in a plane; and an elementary course in the differential and integral calculus (1881)
Olney, Edward, 1827-1887 · New York : Sheldon and Co. · leaf 60
G H parallel toA B. Take G F = H F = G, and draw C M, andC N through G and H. (The construction is thencompleted as in the problem above.) To show thatany point thus found, as P, is a point in a parabolawhose parameter is 12, observe that LT (=PF):CT (= PR) ::GF :CF. ButGF = CF = 6,by construction.… … r K Fig. 31. 4:S. CoE. 1.—If-^ =^the focal ordinate,!, e., one half the Latus Rectum,the vertex is at ^-pfrom the directrix, and the distance, if = ^i^, or ^the parameter, GH. Ex. 2. Construct an ellipse in which the fixed ratio shall be ^, andthe distance from the focus to the directrix 6. Also…
Geometry, Analytic · Calculus
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