"Frustra laborant quotquot se calculationibus futigant pro inventione quadraturae circuli."
"Futile is the labor of those who fatigue themselves with calculations to square the circle."
--Michael Stifel (1544)People who attempt to "square the circle" are trying to prove that the perimeter of a square is equivalent to the circumference of a circle. Their proofs usually generate rational values of pi.
Hat tip: History of Pi by Petr Beckmann
