guys i have a question about area calculations in autocad.
see what we usually do that if wer calculating slab area we calculate the whole slab and then subtract the areas coming as openings and ducts one by one. but i received a drawing from one of our project consultants, in that drawing they have the boundary of the slab area along with the openings and ducts as plines or boundaries. but that is all one entity and when we enter the list command for that boundary it give us the total area of the slab subtracting the openings and ducts automatically. any ideas how they are doing it or what we are missing here.
looking forward for this answer