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An oblique plane is one inclined to

  • A.neither principal plane
  • B.both principal planes
  • C.the horizontal plane only
  • D.the vertical plane only

Answer: B

Correct answer: both principal planes

An oblique plane is inclined to both principal planes, so a figure in it is foreshortened in both the plan and the elevation and its true shape appears in neither. That is what makes two successive auxiliary projections necessary - the first to bring the figure to appear as a line, the second to view it face on.

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