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Obtaining the true shape of a figure inclined to both principal planes requires

  • A.no auxiliary projection at all
  • B.three successive auxiliary projections in every case
  • C.two successive auxiliary projections
  • D.a single auxiliary projection

Answer: C

Correct answer: two successive auxiliary projections

The first auxiliary is taken on a plane perpendicular to the figure, in which the figure appears as a straight line, and this establishes its inclination. The second is then taken parallel to that line, and hence parallel to the figure, giving the true shape. One auxiliary cannot do both, since the direction of the second depends on the result of the first.

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