Discussion
A cone of 60 mm base diameter and 70 mm axis resting on its base has a plan of diameter
Answer: C
Correct answer: 60 mm
The plan of a cone standing on its base is the base circle itself, projected without foreshortening because the base lies flat on the horizontal plane. So its diameter is the true base diameter, 60 mm, and the axis length plays no part - the height appears in the elevation instead, as the height of the triangle.
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