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Why can angles not be set out in isometric with a protractor?

  • A.because angles in isometric are always exactly 120 degrees
  • B.because every angle is distorted by the projection
  • C.because the isometric axes are not at 90 degrees
  • D.because a protractor cannot be laid on a sloping line

Answer: B

Only lengths along isometric lines survive the projection in a predictable ratio; an angle between two such lines opens or closes according to the plane it lies in. A 90 degree corner of the object appears as either 60 or 120 degrees on the drawing.

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