Stage: 3 Challenge Level: 
You can move the 4 pieces of this jigsaw around and fit them into the outlines shown below. Try for yourself with this interactivity. One square unit is missing in the lower shape.
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Explain what has happened to the missing area? (Of course muggles magic is not magic at all!)
Mathematical reasoning & proof. Circles. Generalising. Tangent. Interactivities. Gradients. Area. Visualising. Cubes. Games.
Published June 2001.
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