An Engineer, a Physicist, and a Mathematician Build a Fence

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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 engineer 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 full riddle is at PM.

Good luck.

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