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A designer sets out a 40 degree chamfer on an isometric drawing with a protractor. The angle drawn will be

  • A.wrong only if the chamfer lies on a vertical face
  • B.wrong, since angles are distorted by the projection
  • C.correct, provided the protractor is aligned to an axis
  • D.correct only on the topmost isometric plane

Answer: B

Angles open or close according to the plane they lie in, so no protractor setting corresponds to the true angle. The chamfer must be located by isometric offsets to the ends of its edges and the line drawn between them.

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