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 217
ircledescribed on the transverse axis. Now let FL bethe perpendicular from the second focus upon thetangent L T, we are to show that FL X FL =BK Join A and L and produce the linetill it meets LF produced in L. Thenthe triangles ALF and ALF are equal,and AL = AL, and L is in the cir-cumference of…
Geometry, Analytic · Calculus
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