tag:blogger.com,1999:blog-4422342195608122004.post6758286164242705305..comments2023-08-23T10:01:43.932-04:00Comments on Bonnie's Blog: 3D design for K-12 and beyond: Math Forum Project: Conic SectionsBonnie Roskeshttp://www.blogger.com/profile/03906813203889595610noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-4422342195608122004.post-1430379100905417272010-02-03T07:29:35.353-05:002010-02-03T07:29:35.353-05:00Don't stop posting such articles. I like to re...Don't stop posting such articles. I like to read stories like that. BTW add some pics :)<br /><a href="http://www.tayx.co.uk/" rel="nofollow">BlindSniper</a>Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4422342195608122004.post-41971224335971887862010-01-27T17:30:16.353-05:002010-01-27T17:30:16.353-05:00Yes, and I had forgotten the incorrect info was in...Yes, and I had forgotten the incorrect info was in the video I made a while ago. But the math forum project has the correct mathematical info - you create a section plane along one of the conic segments, therefore parallel the slope of the cone. Thanks for the comment ;-)Bonnie Roskeshttps://www.blogger.com/profile/03906813203889595610noreply@blogger.comtag:blogger.com,1999:blog-4422342195608122004.post-53246604309379074822010-01-27T15:49:27.144-05:002010-01-27T15:49:27.144-05:00Sorry to point it out but in the video after 3:36 ...Sorry to point it out but in the video after 3:36 there's a huge math error. <br />You have an ellipse and you say "click a point anywhere and move the mouse [and the section plane] until the section plane is entirely within the cone. This 2D object is a parabola".<br /><br />NO: that's another ellipse (part of an ellipse but still an ellipse).<br /><br />To obtain a parabola the section plane must be parallel to a generatrix of the cone. (a generatrix is any straight line that belongs to the cone).Guzmanhttps://www.blogger.com/profile/10049622554670704304noreply@blogger.com