Calculating Areas
To subtract areas from a calculation
- While a combined area is displayed, enter s (Subtract).
- Use one of the following methods:
-
Specify points to define the area you want to subtract and press ENTER.
- Enter o (Object) and select the objects you want to subtract.
AutoCAD LT updates the running total as you define new areas.
- Press ENTER to end the command.
Inquiry toolbar: 
Command line equivalent: AREA