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You may want to look at Overlaps before you try this problem.
Here are some pairs of shapes:
What overlap shape would you get if you overlapped them halfway across each other?
Here are some more pairs of shapes. What overlap shapes would you get this time?
Which of these overlap shapes did you find?
Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
The image in this problem is part of a piece of equipment found in the playground of a school. How would you describe it to someone over the phone?