| http://www.w3.org/ns/prov#value | - But when it is sought to ascertain the area or the length of the side of a square, hexagon, or other regular polygon, or the several sides of an irregular figure, which shall be equal to or otherwise proportionately greater or less than a circle of a given diameter, the error, if any, in the ratio between the diameter and the circumference, enters at once into the work, and remains and propagates
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