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'Four Triangles Puzzle' printed from http://nrich.maths.org/
If you cut a square diagonally from corner to corner you get four
right-angled isosceles triangles.
How many different shapes can you make by fitting the four
triangles back together?
You may only fit long sides to long sides and short sides to short
The whole length of the side must be joined.
Record what you do on squared paper.
You could use this interactivity to try out your ideas.
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