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Pythagoras Perimeters

If you know the perimeter of a right angled triangle, what can you say about the area?

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Hollow Squares

Which armies can be arranged in hollow square fighting formations?

Difference of Two Squares

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

You may want to take a look at Pair Products - it is a similar problem but offers a little more structure and support.