Hyperbola

Try moving the red dot to see how hyperbola is defined. You can make a different hyperbola by adjusting the value c.

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

The black dots are called "foci." (The word "foci" is the plural of "focus.")

M Ondrus, March 1, 2012, Created with GeoGebra