| Open the compass a radius of 9 or 10 cm. |
| Draw a semicircle near the bottom of the short side of a piece of paper. |
| Draw a small square near the circle on the same side as the center O. |
| Place the plastic (unbent) perpendicular to the paper, tangent to
the circle near its middle. |
| Slowly bend the plastic to fit the semicircle. |
| Observe the changes in the image of the square. |
| Draw one of the apparent images of the square. |
| Are any of the image sides straight? |
| Compare the area of the image shape with that of the original square. |
| Click the right picture for an enlargement in a new wondow. Here blue plastic
wasa used. |
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| Repeat this experiment with the small square drawn on the
side of the semicircle opposite the observer. |
| Compare the size of the inverted square and its image. |
