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A frustum of a cone develops as

  • A.a full sector of a circle
  • B.a rectangle of the mean circumference
  • C.a fan of separate triangles
  • D.the region between two concentric arcs

Answer: D

The inner arc corresponds to the small end and the outer to the large end, both struck from the apex of the complete cone. The apex must therefore be located by producing the slant sides even though it has been cut away.

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