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An auxiliary plane used to find the true length of a line is set

  • A.at forty-five degrees to both principal planes
  • B.coincident with the vertical plane
  • C.parallel to the line itself
  • D.perpendicular to the line itself

Answer: C

Correct answer: parallel to the line itself

A line projects at true length onto any plane parallel to it, so the auxiliary is set parallel to the line and the view taken on it gives the length directly. Setting the auxiliary perpendicular to the line would give the opposite result - the line seen end on as a point.

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