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Which lines on an object may be measured directly in an isometric drawing?

  • A.those inclined to all three isometric axes
  • B.any straight line on the object whatever
  • C.only those lying in the topmost isometric plane
  • D.those parallel to one of the three isometric axes

Answer: D

Isometric lines are foreshortened by the common ratio and so scale uniformly, whether the drawing uses true lengths or the isometric scale. A line oblique to all three axes foreshortens by a different amount and must be located from the ends of isometric lines instead.

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