Discussion
Assertion: a circle inclined to the plane of projection projects as an ellipse. Reason: the diameter along the axis of tilt is unchanged while that across it foreshortens.
Answer: C
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism precisely. Tilting shortens dimensions measured across the axis of tilt by the cosine of the angle and leaves those along it untouched, so the circle’s diameters are affected unequally and the figure becomes an ellipse - with the true diameter as the major axis and its foreshortened counterpart as the minor.
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