 The accuracy of Milü to the true value of can be explained using the continued fraction expansion of, the first few terms of which are formula_2.A property of continued fractions is that truncating the expansion of a given number at any point will give the "best rational approximation" to the number.To obtain Milü, truncate the continued fraction expansion of immediately before the term 292; that is, is approximated by the finite continued fraction formula_3, which is equivalent to Milü.