My code / solution to calculate Pi using the ArcTan Taylor series expansion, as used by William Shanks to calculate Pi to 100 digits by hand in the 1800's. Pi = 16 arctan (1/5) - 4 arctan (1/239) ...

Definition: Arctan is the inverse function of the tangent function which is the ratio of the side opposite an angle divided by the side adjacent to the angle (i.e., tan = opposite/adjacent). It is ...

The Mathematical Gazette is the original journal of the Mathematical Association and it is now over a century old. Its readership is a mixture of school teachers, college and university lecturers, ...

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