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igonvalue
on May 28, 2014
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Physicists Prove Surprising Rule of Threes
It looks like it's only accurate to two decimal places; the circumference is approximately 3.02.
http://www.wolframalpha.com/input/?i=ellipse+1%2F2%2C+cos%28...
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http://www.wolframalpha.com/input/?i=ellipse+1%2F2%2C+cos%28...