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Equal regular pentagons are placed together to form a ring.  
The diagram shows the first three pentagons.

How many pentagons are needed to complete the ring?

circle with chain of 3 pentagons.

 

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.
You can find more short problems, arranged by curriculum topic, in our short problems collection.