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The eccentricity of a conic is the ratio of the distance of a point from the focus to its distance from the

  • A.centre of the conic section
  • B.directrix
  • C.vertex of the curve
  • D.axis of the curve

Answer: B

That single ratio distinguishes all four conics from one another and is constant for every point on a given curve. It is the basis of the eccentricity method of construction, which draws any conic from a focus and a directrix alone.

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