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A circle may be regarded as an ellipse whose eccentricity is

  • A.zero
  • B.exactly one
  • C.greater than one
  • D.undefined for a closed curve

Answer: A

The two foci coincide at the centre and the directrix recedes to infinity, so the ratio vanishes altogether. It is why the circle is treated as the limiting member of the conic family rather than as a separate kind of curve.

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