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Originally Posted by Mark Dexter
A cone needs to come to a point, so I don't think it applies to the BI rule. - Mr. Annoying Geometry Guy.
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Well, if you consider points at infinity in projective geometry
, a cylinder may be considered as a cone. But an exposition of projective geometry in three-dimensional space seems a bit off-topic here, doesn't it?
Ciao
Two parallel straight lines intersect at a point at infinity, when they don't care any more.