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A plane whose only trace is a line parallel to the reference line must be

  • A.parallel to the vertical plane
  • B.perpendicular to both principal planes
  • C.inclined equally to both principal planes
  • D.parallel to the horizontal plane

Answer: D

Correct answer: parallel to the horizontal plane

A plane parallel to the horizontal plane never meets it, so it has no horizontal trace at all; it meets the vertical plane in a line parallel to the reference line, which is its only trace. The absence of one trace is itself the identification, and the mirror case - a single trace in the plan - means parallel to the vertical plane.

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