XPath/XQuery pi function

Summary

Returns an approximation to the mathematical constant π.

Signature

math:pi(
) as xs:double

Properties

This function is deterministic, context-independent, and focus-independent.

Rules

This function returns the xs:double value whose lexical representation is 3.141592653589793e0

Examples

The expression 2*math:pi() returns 6.283185307179586e0.

The expression 60 * (math:pi() div 180) converts an angle of 60 degrees to radians.