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Folded A4
Age 11 to 14
ShortChallenge Level 
Answer: b
The diagrams show the fold lines that produce each of the four possible shapes.
The shape formed by folding along a line between two opposite corners is shown in blue.
a) 
b) 
c) 
d) 
e) 
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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