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Where must an auxiliary plane be placed to reveal the true shape of a cut?

  • A.at forty-five degrees to the section plane
  • B.parallel to the section plane
  • C.perpendicular to the section plane
  • D.parallel to the axis of the solid

Answer: B

Parallelism between the auxiliary plane and the cutting plane is what removes the foreshortening in every direction at once. Setting the auxiliary perpendicular to the section plane instead would reduce the whole cut surface to a single straight line.

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