**Play**button at the bottom-left of the applet to animate. What do you observe?

- Click the
**Pause**button and refresh your browser. - What is the area of the square made up of the two triangles and two trapezoids?
- Check the
**Assemble Manually**check box to show the slider. - Set the slider and to 90, and then
*a*to 0 and*e*to 8. What is the area of the rectangle? - Can you explain why there is an excess area?

Downloadable Applet to follow

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