#2
With CMS IntelliCAD 7.2, use boundary polyline command to pick an inner point, then a closed polyline should be created. At that point just use AREA command and select ENTITY to retrieve the boundary polyline area and perimeter (that's also available).

#3
We often have to find the area of a 2d boundary in our CAD environment. Sometimes our boundaries have curves on them. So far, using the BOUNDARY command on a shape with a curve will create a polyline, but typically draws the polyline on the chord of the arc instead of drawing the polyline along the arc. So, a boundary with a curve becomes a boundary of all straight lines.

I've found a way around this. Make a copy of all the entities that create your area. With all these entities selected, use the REGION command. This command will create a region around your boundary. You can see the region's area under geometry in the properties window.