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A plane figure appearing as a straight line in a view indicates that the figure is

  • A.perpendicular to that plane of projection
  • B.parallel to that plane of projection
  • C.inclined at forty-five degrees to that plane
  • D.of negligible area

Answer: A

Correct answer: perpendicular to that plane of projection

A plane figure projects as a line only when it is seen edge on, which happens when the figure is perpendicular to the plane of projection. This is the observation that drives the auxiliary method: the first auxiliary is chosen precisely to make the figure appear as a line, and the second is taken at right angles to it.

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