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Possible Duplicate:
Do We Need the Digits of $\pi$?

Are we at best, estimating things when we use formulas involving pi to describe the area, etc. of things?

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    "how can we ... rely on it for real world calculations?" - In the real world, there is no such thing as a "real" circle. The wheels, cans, and other such things are approximations to the real thing; manufacturing will always give things with a few imperfections.2011-12-30

2 Answers 2