Discussion
A circle inclined to the plane of projection appears in that view as
Answer: D
Correct answer: an ellipse
The diameter lying along the axis of tilt keeps its true length and every diameter perpendicular to it is shortened by the cosine of the inclination, so the circle projects as an ellipse whose major axis is the true diameter and whose minor axis is that diameter foreshortened. Only at ninety degrees does it degenerate into a straight line.
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