[b][u]Vocabulary[/u]: [br][/b][br][b][u]Parabola[/u][/b] - The set of all points (x, y) such that each point is equidistant (the same distance) from a point called the focus and a line called the directrix.[br][br][b][u]Directrix[/u][/b] - A line that always lies outside the parabola and is perpendicular to the Axis of Symmetry. [br][br][b][u]Focus[/u][/b] - A point that always lies inside the parabola. [br][br][b][u]Applet Directions[/u]: [/b][br][br]Position the directix using points A and B.[br]Position the Focus. [br][br]Move point D along the directrix to construct the parabola. [br]Press Ctrl-F to delete the trace.

Special Thanks to: [br][br]Jerel L. Welker[br]Lincoln Southwest High School[br]Lincoln, NE[br]jwelker@lps.org[br][br]This is a wonderful applet.