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I'm not sure that most people have memorized the first 10 digits of Pi. I know 3 for certain, any more than that and I can look them up.

I think most would know the first 5 because it's pretty accurate making 3.14159 into 3.1416 and you forget what's after the 9

3.14159 might even be a stretch though. I'm pretty sure the average person (or american at least) would only know 3.14