### 29.1.3. Evaluate

The Evaluate tab is used to evaluate an expression when all variables upon which the equation depends are specified. CFX-Pre automatically finds the variables associated with an expression, even if the expression depends on another expression.

For example, when previewing the expression `halfRadius`, defined as `0.5*radius`, where `radius` is an expression that depends on the variables `x` and `y`, CFX-Pre presents `x` and `y` as the variables upon which `halfRadius` depends.

1. Under Expression Variables, enter values for all listed variables.

2. Click Evaluate Expression.

   The resulting expression is evaluated using the given variable values.

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