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A frustum of a pyramid or cone is the portion between the base and

  • A.a plane parallel to the base
  • B.a plane inclined to the base
  • C.the apex itself
  • D.a plane perpendicular to the base

Answer: A

Correct answer: a plane parallel to the base

A frustum is what remains when the top of a pyramid or cone is cut off by a plane parallel to the base. Because the cut is parallel, the two ends are similar figures, which is what makes the frustum easy to draw and to develop. A cut inclined to the base gives a truncated solid instead, whose ends are dissimilar.

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