<cat>libraryfunc</cat>⤶ # Not a function⤶ ⤶ This is NOT a function, it's a variable containing the mathematical constant pi. (`3.1415926535898`) <function name="pi" parent="math" type="libraryfield">⤶ <description>⤶ A variable containing the mathematical constant pi. (`3.1415926535898`) See also: <page>Trigonometry</page> ⤶ ⤶ <example>⤶ ⤶ <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>⤶ </rets>⤶ </function>⤶ ⤶ <example>⤶ <code> print( math.cos( math.pi ) ) </code> <output> ```⤶ -1 ```⤶ </output> </example> ⤶ # Floating point precision considerations⤶ ⤶ 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.⤶ <example> <description> sin(π) = 0, but because floating point precision is not unlimited it cannot be calculated as exactly 0. ⤶ `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>