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How does an isometric drawing differ from a true isometric projection?

  • A.it shows only two of the three isometric planes
  • B.it uses true lengths instead of foreshortened ones
  • C.it uses foreshortened lengths instead of true ones
  • D.it places the axes at 90 degrees rather than 120

Answer: B

Drawing with true lengths makes the figure larger than the projection by about 22.5 per cent, the reciprocal of 0.816. Since the shape and the proportions are unaffected, the drawing is what is normally made and the projection is reserved for cases where absolute size matters.

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