A set of built-in functions and constants used in parameter values and variable expressions is included. The constants are the equivalent of entering a numeric value such as 3.14159. The functions take arguments, each of which can have a unit. Functions evaluate to a numerical value with a unit. To display a list of the functions and constants, on the Variables tab of a Properties dialog box, click the button.
To use a function or constant in a parameter or variable, right-click it and choose a Copy command.