Discussion
Comparing a cylinder with a cone for oblique cuts, the cylinder yields
Answer: C
Correct answer: an ellipse for every oblique cut clear of the bases
The cylinder’s generators are parallel, so any oblique plane crossing them all meets every one and the section always closes into an ellipse. A cone’s generators converge, so a plane may fail to meet some of them, and that is what produces the parabola and hyperbola which a cylinder cannot give.
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