Hi Hugh,
>> no, but in any case, they would have changed by now!
Quite True. The easy way is how the State of Indiana tried to handle the problem with PI. From A History of PI at http://www-gap.dcs.st-and.ac.uk/~history/HistTopics/Pi_through_the_ages.html
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In the USA the value of PI gave rise to heated political debate. In the State of Indiana in 1897 the House of Representatives unanimously passed a Bill introducing a new mathematical truth.
Be it enacted by the General Assembly of the State of Indiana: It has been found that a circular area is to the square on a line equal to the quadrant of the circumference, as the area of an equilateral rectangle is to the square of one side.
(Section I, House Bill No. 246, 1897)
The Senate of Indiana showed a little more sense and postponed indefinitely the adoption of the Act!
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Bill