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Which section of a cone is bounded by two straight lines?

  • A.one taken parallel to the base
  • B.one taken parallel to a generator
  • C.one taken parallel to the axis
  • D.one taken through the apex

Answer: D

Correct answer: one taken through the apex

A plane through the apex meets the curved surface in two straight generators, so the section is a triangle and contains no curve. Every other plane cuts the curved surface obliquely and produces a conic - circle, ellipse, parabola or hyperbola according to its inclination.

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