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The isometric scale bears to the true scale the ratio

  • A.0.816 to 1
  • B.1.225 to 1
  • C.0.707 to 1
  • D.1.414 to 1

Answer: A

Edges inclined equally to the three axes are foreshortened in that proportion, which is the square root of two thirds. Drawing with true lengths instead gives an isometric drawing rather than a true isometric projection.

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