Demonstration of Hyperbola Definition

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Illustration showing the definition of an hyperbola. “An hyperbola may be described by the continuous motion of a point, as follows: To one of the foci F’ fasten one end of a rigid bar F’B so that it is capable of turning freely about F’ as a center in the plane of the paper.”


G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 445


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