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A transition piece pattern made by the radial line method proves unusable. The reason is that the surface has

  • A.a base perimeter that cannot be measured
  • B.no single apex on which the generators converge
  • C.generators that are all of equal length
  • D.double curvature at every point of its surface

Answer: B

Correct answer: no single apex on which the generators converge

The radial line method fans the pattern about an apex, which exists only where the generators converge to a point. A transition piece joining, say, a square to a circle has no such apex, so it is developed by triangulation instead - dividing the surface into triangles whose true lengths are found individually.

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