Chain Nailed to the Wall

There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other?


Both ends are nailed with the same nail.

In order for the 10 foot chain to dip down 5 feet, it must dip 5 feet down and 5 feet up, totaling the length of the chain.

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