When you introduced a parabola you wrote that to generate it you cut a cone with a plane perpendicular to its side. You should have said you cut it with a plane parallel to its side.
posted by Richard Gorman
September 1, 2012
JSTOR, the online academic archive, now contains complete back issues of American Scientist from its inception in 1913 (as Sigma Xi Quarterly) through 2005.
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