itsdistance from a fixed straight line, called the diiectrix.As in the case of the circle and of the parabola,we shall form the equation of the ellipse from itsdefinition, the equation being thus the accurate andcomplete expression, in algebraic language, of thedefinition of the curve. The… … K F X Let F be the focus, and MZ the directrix; and letFZ be perpendicular to il/Z. 133 134 Analytical Geometry. Divide FZ internally at A and externally at A sothat TA ^ AF AZ = and^,^=e; or FA = e.AZ, and AF=e.AZ; then A and A! are points on the locus. Bisect AA at C ; and let AA = 2a, so that…
Geometry, Analytic
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