Discussion
In orthographic projection the projectors are
Answer: A
Correct answer: parallel to one another and perpendicular to the plane
Both conditions matter. Parallel projectors mean there is no convergence and hence no foreshortening with distance; perpendicular projectors mean a face parallel to the plane is projected at its true size. Together they are what make the drawing measurable, which is the whole reason engineering uses orthographic projection rather than perspective.
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