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A frustum of a pyramid develops as

  • A.a band of trapezia laid side by side
  • B.a band of triangles laid side by side
  • C.the region between two concentric arcs
  • D.a rectangle of the mean perimeter

Answer: A

Correct answer: a band of trapezia laid side by side

Each face of a pyramid is a triangle, and cutting the top off leaves a trapezium. The frustum’s development is those trapezia laid edge to edge, each drawn to its own true dimensions. Concentric arcs belong to a cone’s frustum, whose surface is curved rather than faceted.

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