Discussion
Assertion: a line inclined to both principal planes shows its true length in neither view. Reason: each projection foreshortens a line not parallel to that plane.
Answer: A
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason is the whole of the explanation. Orthographic projection preserves length only along directions parallel to the plane of projection, so a line not parallel to a given plane is shortened in that view. A line inclined to both principal planes is parallel to neither, so both views shorten it and an auxiliary parallel to the line is needed.
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