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The radial line method is appropriate when a solid's generators

  • A.neither converge nor run parallel to one another
  • B.are curved rather than straight throughout
  • C.converge upon a common apex
  • D.run parallel and are all of equal length

Answer: C

Convergence on a point makes that point the natural centre for the pattern, struck as a sector or a fan of triangles with the true slant length as radius. Using the vertical height as that radius instead is the commonest error in such a development.

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