Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 32
It is seen that the ellipse may also be defined as the locus ofthe points, the snni of whose distances from two fixed points,the foci, is constant. Let the plane cut both sheets of the cone. With the same notation as before, PF= PT PF= PT; lienee PF- PF = TV = a constant. , PT PDFrom the similar…
Geometry, Analytic
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