Discussion
A 50 mm diameter circle in an isometric drawing gives an ellipse whose major axis is about
Answer: A
An isometric drawing is set out with true lengths, so it comes out larger than the true isometric projection by the reciprocal of the isometric scale, \[ \frac{1}{0.816} \;=\; 1.225. \]
In the projection the major axis of the ellipse equals the circle's own diameter, so in the drawing it is that diameter enlarged by the same factor:
\[ \text{major axis} \;=\; 1.225\,d \;=\; 1.225 \times 50 \;=\; 61.25 \;\approx\; 61.3\ \mathrm{mm}. \]
The 50 mm offered as a distractor is the major axis of the true isometric projection, and 40.8 mm is 50 mm wrongly reduced by the 0.816 scale instead of enlarged by its reciprocal.
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