pi - Ratio of circle's circumference to its diameter

Syntax

Description

pi returns the floating-point number nearest the value of π. The expressions 4*atan(1) and imag(log(-1)) provide the same value.

Examples

Find the sine of π:

sin(pi)

returns

ans =

   1.2246e-16

The expression sin(pi) is not exactly zero because pi is not exactly π.

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