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A line perpendicular to the horizontal plane appears in the plan as

  • A.a point
  • B.its true length
  • C.a foreshortened length
  • D.a line parallel to the reference line

Answer: A

Correct answer: a point

Perpendicular to the horizontal plane means vertical, and a vertical line viewed from above is seen end on, so its plan is a single point at the position of both ends. Its elevation shows its true length, since the line is parallel to the vertical plane.

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