Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 183
resses the radius vector of P as afunction of the vectorial angle cf), is the polar equation of thejKirabola, ichen the focus is taken cts pjole and the perpendicularfrom the focus to the directrix as polar axis. ^ 173. Polar Construction of Parabolas. By means of theequation (1) the parabola can… … the value 2 a for ^ = ^77, and becoming infinite as <^ ap-proaches the value ir. For any negative value of ^ (between 0 and — tt) the radiusvector has the same length as for the corresponding positivevalue of (^; this means that the parabola is symmetric withrespect to the polar axis. The…
Geometry, Analytic
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