Problem a homeowner builds three sections of a chain-link, Ask an Expert

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Problem: A homeowner builds three sections of a chain-link fence as shown in the figure where L = 10.00 m. Afterwards he gets tired, and decides to walk straight back to where he started.

Part A: How far did he have to walk to get there?

I don't know how to get that answer for the above problem. Please help! Thanks.

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