For example, an extended F ... Trapezoidal approximations of fuzzy numbers preserving the expected interval—Algorithms and properties. Fuzzy Sets and Systems (2008). Back to "Numerical Analysis" ...

In Archimedes' day, close approximations of pi had been known for over 1,000 years. An Egyptian document dated to 1650 B.C., for example, gives a value of 4 (8/9) 2 , or 3.1605.