# Geometric parameter: definition (structure)

## Definition

A geometric parameter is defined by:

• a name
• an algebraic expression

## Name

The name to identify the geometric parameter is set by the user during the creation of this one.

A comment (optional) can be added to the name.

## Algebraic expression

The algebraic expression can contain:

• constants
• geometric parameters (created beforehand)
• basic mathematical functions using operators : +, -, *, /, ( )
• usual mathematical functions admitted by FORTRAN.

The mathematical functions are described in section Functions.