Tangent  Chord
How to Use this Applet
The Graph Area
 Drag any highlighted location on the circle ( • ) to move that location along the circle.
 Drag any nonhighlighted location on the circle to change the radius of the circle.
 Drag the center of the circle ( • ) to reposition the circle.
 <SHIFT>+drag the center of the circle ( • ) to reposition the circle horizontally or vertically.
Other
 Use the "RESET" button to restore the applet to the initial state.
