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. |