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A vertical line 50 mm long has a plan that appears as

  • A.a 35.4 mm line at forty-five degrees
  • B.a point
  • C.a 50 mm line perpendicular to the reference line
  • D.a 50 mm line parallel to the reference line

Answer: B

Correct answer: a point

A vertical line is perpendicular to the horizontal plane, so it is seen end on from above and its plan is a single point where both ends coincide. Its length appears in full in the elevation, since the line is parallel to the vertical plane, so nothing is lost - the information is simply divided between the two views.

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