Circumference = 2πr or are you using area of circle=πr^2... hhmmm... or just simply use a ruler to measure the radius? I think it's pretty obvious with what that very nice person was doing. That very nice person was trying to divide the mooncake equally to everyone. In order to be precise with her calculation, she needed a scientific calculator and a ruler to measure the length. I think no one has ever cut a mooncake using a plastic knife and a ruler. But in the end, everything turned out to be unequal... eh... my mom cut better...
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