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Which method is used for a transition piece joining a square duct to a round one?

  • A.the parallel line method
  • B.the radial line method
  • C.the approximate zone method
  • D.the triangulation method

Answer: D

The surface is divided into a series of triangles whose true sides are found individually, and the pattern is built by laying them out edge to edge. Neither parallel generators nor a common apex exists on such a surface, so neither simpler method applies.

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