... it. Quite neat! - --Peter - -----Original Message----- From: Scott Steketee [mailto:SSteketee@keypress.com] Sent: Saturday, March 01, 2008 7:46 AM To: Peter Ash; approve@support1.mathforum.org Subject: Re: Conic Sections Hi Peter, The Sketchpad construction is not difficult. Construct your ellipse/hyperbola as the locus of points equidistant from a fixed point and a circle. ...