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Circumference and Diameter
Age 11 to 14
ShortChallenge Level 
Which of the following could be the graph showing the circumference C of a circle in terms of its diameter d?
If you liked this question, here is an NRICH task which 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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