Plane and solid analytic geometry; an elementary textbook (1904)
Ashton, Charles Hamilton, 1866-1936 · New York, C. Scribner's Sons · leaf 129
article that the curve approaches coinci-dence with these lines. Such a line is called an asymptote.If we continue to increase 0, we see that there will be no real value oi.p until tan 6 again becomes numerically b>less than — Then p goes through the same changesa in value, decreasing until it… … Place the points F and D on the X-axis so thatFC=OF md DC=CD, and draw DH perpendicular Ch. IX, § GG] CONIC SECTIONS 113 to the X-axis. The symmetry of the curve again shows,as in the ellipse, that the hyperbola may be said to havetwo foci, J7 and F\ and two directrices, DR and DW. We can now…
Geometry, Analytic
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