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An edge of a solid is drawn as hidden when it lies

  • A.parallel to the plane of projection
  • B.in the plane of projection itself
  • C.behind another surface as seen in that view
  • D.at the outline of the solid in that view

Answer: C

Correct answer: behind another surface as seen in that view

An edge is hidden when some face of the solid lies between it and the observer in that particular direction of viewing, so the same edge may be visible in one view and hidden in another. Being at the outline guarantees visibility, and lying in or parallel to the plane of projection has no bearing on whether it can be seen.

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