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In how many ways can a square be cut in half using a single straight line cut?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Can you work out the area of the inner square and give an explanation of how you did it?
With one cut a piece of card 16 cm by 9 cm can be made into two pieces which can be rearranged to form a square 12 cm by 12 cm. Explain how this can be done.