Point on a Hyperbola

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Illustration of a point on a hyperbola. “If d denotes the abscissa (x-coordinate) of a point of an hyperbola, r and r’ its focal radii, then r = ed - a, and r’ = ed + a.”

Source

G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 450

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