<function name="pi" parent="math" type="libraryfield"> <description> A variable containing the mathematical constant pi. (`3.1415926535898`) See also: <page>Trigonometry</page> <note>It should be noted that due to the nature of floating point numbers, results of calculations with `math.pi` may not be what you expect. See second example below.</note> </description> <realm>Shared and Menu</realm> <rets> <ret name="" type="number">The effective infinity.</ret> <ret name="" type="number">The mathematical constant, Pi.</ret> </rets> </function> <example> <code> print( math.cos( math.pi ) ) </code> <output> ``` -1 ``` </output> </example> <example> <description> `sin(π) = 0`, but because floating point precision is not unlimited it cannot be calculated as exactly `0`. </description> <code> print( math.sin( math.pi ), math.sin( math.pi ) == 0 ) </code> <output> ``` 1.2246467991474e-16 false ``` </output> </example>