I am not sure what you mean with "make surfices".
If you want to calculate an area, you can fill the boundaries with a hatch. When the hatch is created, the hatched area is indicated in the command line. It also works with arks. The boundaries have to be a closed shape.
But unfortunately there is no way to ask the area of an existing shape.
There is Info - Polygonal Area, but this doesn't work with arks.