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Which of the following lines shows its true length in the plan?

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

Answer: A

Parallelism to the horizontal plane is what preserves the length when viewed from above. A line perpendicular to that plane appears as a point in the plan, and one inclined to both is foreshortened in every principal view.

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