Test your skills of deduction with the May 2021 edition of Riddle Me This: Fence Building

A farmer challenges an engineer, a physicist, and a mathematician to build him a fence that encloses the most area with the least amount of fencing.

The mathematician makes a circular fence, claiming that it is most efficient.

The physicist made a long straight line of fence and said the length was infinite, as fencing half the world was the most efficient way.

The engineer laughed at the others, and then proceeded to build the winning fence. What did he build?

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