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Can you imagine gradually moving one shape across the other one?
It might help to draw the shapes, or cut some out from tissue paper or overhead transparencies.
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?
An activity making various patterns with 2 x 1 rectangular tiles.
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?