Discussion
For a pyramid resting on its base with the axis vertical, the lateral edges in the plan are
Answer: A
Correct answer: all visible
Looking down on a pyramid standing on its base, the lateral faces all slope towards the observer and nothing lies above the lateral edges, so all of them are seen and all are drawn as continuous lines, running from the corners of the base to the centre. Hidden edges would appear only if the solid were tilted so that some face came to lie over another.
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