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A 100 mm edge is drawn in true isometric projection as

  • A.122.5 mm
  • B.100 mm
  • C.70.7 mm
  • D.81.6 mm

Answer: D

Multiplying by the isometric ratio of 0.816 gives 81.6 millimetres. An isometric drawing would show the full 100 millimetres and be correspondingly larger, which is why the two must not be confused when absolute size matters.

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