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Folded A4

Stage: 3 and 4 Short Challenge Level: Challenge Level:1

A sheet of A4 size paper (297mm x 210mm) is folded once and then laid flat on the table.

Which of these shapes could not be made?

shapes

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.
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