JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Apply a Perimeter Constraint Select the Perimeter Constraint tool. Select a closed element. Enter a data point to apply the constraint. (Optional) To change the value of the constrained perimeter, key in the desired value in the perimeter box and enter a data point to accept the constraint. Applying a perimeter constraint to a closed element Parent topic: Perimeter Constraint