Excerpt from Elementary Conics
IF a straight line and a point be given in position in a plane, and if a point move in a plane In such a manner that its distance from the given point always bears the same ratio to its distance from the given line, the curve traced out by the moving point is called a Conic Section.
The fixed point is called the Focus, and the fixed line the Directrix of the conic section.
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PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Artikel-Nr. LW-9781330443583
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