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A plane parallel to a generator of the cone gives

  • A.a hyperbola with two branches
  • B.a pair of intersecting straight lines
  • C.a parabola
  • D.an ellipse of high eccentricity

Answer: C

Correct answer: a parabola

A plane parallel to a generator is at exactly the critical inclination: it cuts one nappe only, but never closes, because it runs alongside the very line it would have to cross to come back. The result is the single open branch of a parabola, and it is the boundary case between the ellipse and the hyperbola.

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