Discussion
A circle of 50 mm diameter inclined at 30 degrees to the plane of projection projects as an ellipse whose minor axis is
Answer: D
Correct answer: 43.3 mm
The minor axis is the diameter perpendicular to the axis of tilt, foreshortened by the cosine: \[ 50 \cos 30^\circ = 50 \times 0.866 = 43.3\ \mathrm{mm}. \] It is always the shorter of the two axes, so an answer larger than the true diameter must be wrong.
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