Measures the area of a closed defined boundary.
- Select points to define segments of the boundary. The points do not have to lie on existing objects; they can be anywhere. A thick line indicates the progress of the boundary.
- Select the first point again to close the boundary, or select Close from the local menu or Inspector Bar. The defined area is filled.
- The calculated area is displayed in the Measurement Info Palette.
Local menu option:
By Entity: Enables you to select the entire perimeter of an object. 
You can also use this option to define a chain along a portion of an object. This is useful when you need to measure the area of curved objects.
- Select a closed object, or select points along a portion of an object.
- Select the first point again to close the boundary, or select Close from the local menu or Inspector Bar. The defined area is filled.
You can also use By Entity to define a boundary along more than one object.