Hyperbola from the Definition

Hyperbola - The set of all points such that the difference in the distance from two points is a constant. Position the Center C, Foci F1 and Vertice V1. Drag the Slider to construct the hyperbola. Press Ctrl-F to clear the tracing of the hyperbola. 
Jerel L. Welker Lincoln Southwest High School Math Department Lincoln, Nebraska jwelker@lps.org