CONCEPT BY RICHARD TOOGOOD AND RON BLOND

**HOW TO USE THIS APPLET**

## The slider area

The sliders change parameters h, k and p in the quadratic relation.

- Drag a slider to change the value of a parameter.
- The left and right arrow keys can be used to change the selected parameter [light blue].
- The up and down arrow keys can be used to increase or decrease the selected parameter. (Use this feature for fine adjustments.)
- If the arrow keys don't respond, click the cursor in the applet frame then try again.
- Drag a parameter scale to "move" it. (ie. Change the range but maintain the scale "length".)
- Drag towards or away from a parameter thumb to "re-scale" the scale.
- Select the corresponding parameter button to enter a value for a parameter.

## The graph area

- Drag the vertex of the parabola to move it in the coordinate system.
- Drag any location along the parabola to change parameter a.
- Click and drag any other location to see the coordinates of the cursor and locations along the graph of the parabola.
- Move the cursor into the equation area to see which type of parabola (horizontal or vertical) is being displayed.
- THE SHIFT KEY : Click and drag in the graph area to move the entire coordinate system.
- THE CONTROL KEY : Click and drag in the graph area towards or away from the origin to change the x and y axis scale.

## Other

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

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