Re: Obsolete Skills
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Another obscure mathematical curiosity that I discovered (and since have found out is of course very well known, but I had never known it before and so constructed it myself) is that pi ~ 355/113. This might not seem impressive, but it's accurate to 8.5 millionths of 1%.
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One of the simple expansions of pi converges to 3, 22/7, and this, in the first 3 or four terms. I think just a few more terms of that expansion (I wish I could remember what it was) can give you dozens of digits.
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I believe it's 4-(4/3)+(4/5)-(4/7)+(4/9)-(4/11)...
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