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A profile plane is one perpendicular to

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

Answer: A

Correct answer: both principal planes

A profile plane stands perpendicular to the horizontal and the vertical planes at once, so both its traces are perpendicular to the reference line and a figure lying in it appears as a straight line in both principal views. Its true shape needs a side view, which is precisely why the profile view exists.

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