A simple worksheet to work with families of parabolas.  

The graphed parabola is defined by a focus and a directrix.  Both of these can be changed by dragging the appropriate points in the graph.
The point on the parabola can also be dragged around.

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Mike May, S.J., 2/20/2006, Created with GeoGebra

GeoGebra is a GNUed software package for mathematics visualization.  The home for the applications is

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Last updated By Mike May, S.J., August 12, 2007.