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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: College math
Topic ID: 396
Message ID: 4
#4, RE: Brief conic section proof?
Posted by alexb on Sep-24-07 at 00:31 AM
In response to message #3
The proof is the same as Vladimir's. You have an equation of a plane and a coordinate system in that plane. All that you have to do is to write an equation of a straight cone with an ellipric base. Just add a coefficient to the equation of the circular cone.