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One cut of a right circular cone yields no curve at all. Which is it?

  • A.one passing through the apex
  • B.one parallel to the base
  • C.one parallel to a generator
  • D.one inclined more steeply than a generator

Answer: A

Correct answer: one passing through the apex

A plane through the apex meets the curved surface along two straight generators, so the boundary is entirely straight. Every other cut produces one of the conics: a circle parallel to the base, a parabola parallel to a generator, and a hyperbola when steeper than one.

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