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A cone is cut by a plane parallel to its axis, clear of the apex. What curve appears?

  • A.an ellipse of large major axis
  • B.a circle of the base's radius
  • C.a hyperbola
  • D.a parabola with its axis vertical

Answer: C

Correct answer: a hyperbola

A plane parallel to the axis is steeper than any generator, so it cuts the surface in a hyperbola. Only one branch appears on a single cone; the second branch belongs to the opposite nappe, which a solid cone does not have.

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