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A solid with its axis perpendicular to the horizontal plane has that axis appearing in the plan as

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

Answer: D

Correct answer: a point

A line perpendicular to a plane of projection projects onto it as a single point, since every part of the line falls on the same spot. So a vertical axis appears as a point in the plan, at the centre of the base figure, while it shows its true length in the elevation. The same rule identifies a vertical edge or a horizontal generator.

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