Discussion
A cylindrical pencil sharpened at one edge is the combination of
Answer: C
The unsharpened body of the pencil is a straight cylinder of uniform circular cross-section. Sharpening tapers one end to a point while keeping that cross-section circular, which is exactly a cone.
So the shape is a cone mounted on a cylinder.
A hemisphere would end in a rounded dome rather than a point, and a frustum would be cut off flat instead of tapering to the graphite tip.
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