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The eccentricity of an ellipse is

  • A.greater than one
  • B.exactly equal to zero in every case
  • C.less than one
  • D.exactly equal to one

Answer: C

Correct answer: less than one

Eccentricity is the ratio of the distance from a point on the curve to the focus and to the directrix, and it classifies the conics completely: zero for a circle, between zero and one for an ellipse, exactly one for a parabola, and greater than one for a hyperbola. The nearer to zero, the more nearly circular the ellipse.

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