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If the line on the right were $0.2\text{mm}$ thick, how long would it need to be to cover an area of one square metre?
If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
Very Long Line
Age 14 to 16
ShortChallenge Level 
If the line on the right were $0.2\text{mm}$ thick, how long would it need to be to cover an area of one square metre?If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
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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