Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 205
--lpi^ is the equation of aparabola having its focus at the origin, but extending indefi-nitely toward the left, as it is the form (1) assumes if thesign of p is changed, p and pi being positive. 190 PLANE ANALYTIC GEOMETRY. … Fig. 85. Any two parabolas having the same focus are said to beconfocal, and the above is a special case of confocal parabolas.Moreover, if we define the angle between two intersectingcurves as the angle between their respective tangents at theirpoint of intersection, two such confocal parabolas as…
Geometry, Analytic
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