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A point lying in the vertical plane has its plan

  • A.on the reference line
  • B.above the reference line
  • C.below the reference line at its full distance
  • D.coincident with its own elevation

Answer: A

Correct answer: on the reference line

A point in the vertical plane is at zero distance in front of it, so its plan has nowhere to go when the planes are opened out and falls on the reference line itself. Its elevation shows its true height above the horizontal plane. The mirror case is a point in the horizontal plane, whose elevation lies on the reference line.

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