Discussion
Of these four, which alone projects as a single point when viewed from above?
Answer: B
Correct answer: the axis of a solid standing on its base
A line projects as a point only when it is perpendicular to the plane of projection, and the plan is projected onto the horizontal plane. The axis of a solid standing on its base is vertical, hence perpendicular to that plane, and so shows as a point. A lateral edge of a pyramid slopes, and the axes in the other two options are horizontal or inclined.
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