Loney, S. L. (Sidney Luxton), 1860-1939 · London, Macmillan and co. · leaf 190
ty and isdenoted by e. The fixed straight line is called the Directrix. The straight line passing through the Focus and per-pendicular to the Directrix is called the Axis. When the eccentricity e is equal to unity, the ConicSection is called a Parabola. When e is less than unity, it is called an… … 197. To find the equation to a Farahola. Let S be the fixed point and ZM the directrix. Werequire therefore the locusof a point F which movesso that its distance from Sis always equal to PM, itsperpendicular distance fromZM. Draw 8Z perpendicularto the directrix and bisect8Z in the point A ;…
Coordinates · Geometry, Analytic
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