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A truncated solid differs from a frustum in that the cutting plane is

  • A.passing through the apex of the solid
  • B.inclined to the base rather than parallel to it
  • C.parallel to the base rather than inclined to it
  • D.perpendicular to the axis in every case

Answer: B

Correct answer: inclined to the base rather than parallel to it

Both are the remainder after the top is removed, and the difference is the attitude of the cutting plane. A frustum is cut parallel to the base, so its two ends are similar and the section is the same shape as the base. A truncated solid is cut at an angle, so the section is a different figure - an ellipse on a cone, for instance.

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