Discussion
An isometric drawing of a 100 mm edge is drawn, in true isometric projection, as
Answer: A
Correct answer: 81.6 mm
True isometric projection foreshortens every axis in the ratio \( \sqrt{2/3} = 0.816 \), so \[ 100 \times 0.816 = 81.6\ \mathrm{mm}. \] An isometric drawing, which is what is usually produced, ignores this and sets off the full 100 mm, giving a figure 22.5 per cent larger but identical in shape.
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