**HOW TO USE THIS APPLET**

## The graph area

- Drag any highlighted location on the circle ( • ) to move that location along the circle.
- Drag any non-highlighted location on the circle to change the radius of the circle.
- Drag the center of the circle ( • ) to re-position the circle.
- Shift-drag the center of the circle ( • ) to re-position the circle horizontally or vertically.

## Other

- Use the "RESET" button to restore the applet to the initial state.

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