Brainteaser #17 – The World’s Best Fence

This is more of a classic riddle!

A farmer requests the best ever fence from 2 individuals, a physicist and mathematician.

The goal is to enclose the largest area using the smallest amount of fencing possible.

The physicist begins by creating a long fence that circles the entire world. By using one just long line, he claims this fences the biggest area possible.

The mathematician laughs at this tremendously wasteful use of fencing and proceeds to effortlessly create the best possible fence.


Show Answer

The mathematician simply creates a tiny fence around himself, and then declares that he is indeed on the outside. This means that the rest of the world outside of him is ‘enclosed’, in a technical sense!

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