A physicist, an engineer, and a mathematician are kidnapped by a tribe of cannibals The chief gives them the same amount of boards and nails and a hammer to each of them and says: ""According to sacred law of ancestors, you all must into the makings of round-up. Who of makings biggest round-up can into free, all of you else can into tribe's lunch!"". The engineer and the physicist both build a circular fence, calculated to have the highest area with the given circumference. The mathematician builds an extremely small fence, steps outside and says: ""Suppose I am inside!""