Problem:
Approximate the area of a circle using inscribed polygons.

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Visualization:
Using pi_circle.exe (from the University of Arizona):

1. First, if the figure on the screen looks like an ellipse rather than a circle use the arrow keys to transform the figure into a circle.
2. Press .
3. Enter the number of sides of the polygon you wish to inscribe in the circle followed by pressing .
4. Repeat the latter step.