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For that same cube in true isometric projection, each edge measures about

  • A.35 mm
  • B.49 mm
  • C.60 mm
  • D.73.5 mm

Answer: B

Correct answer: 49 mm

A true isometric *projection* foreshortens every isometric line by \[ \sqrt{2/3} = 0.8165, \] so \( 60 \times 0.8165 = 49 \) mm. That is the length an actual orthographic projection onto the isometric plane would produce, and drawing it requires a special isometric scale - which is precisely the trouble the isometric drawing avoids.

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