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A line lying in the vertical plane has its horizontal trace

  • A.nowhere
  • B.at the same point as its vertical trace
  • C.on the reference line
  • D.at its own midpoint

Answer: C

Correct answer: on the reference line

A line lying in the vertical plane can only meet the horizontal plane where the two planes themselves meet, which is the reference line. Its horizontal trace therefore lies on the reference line, and its plan lies along that line as well - the whole line being at zero distance in front of the vertical plane.

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