If I sum the area of the 2 polylines , as posted by Kerry , it give me the same area I take from the AREA comand Obj Hatch
Command: area
Specify first corner point or [Object/Add/Subtract]: o
Select objects: I pick on the small blue polyline
Area = 110.26, Perimeter = 39.91
Command:
AREA
Specify first corner point or [Object/Add/Subtract]: o
Select objects: the big polyline
Area = 2306.80, Perimeter = 448.00
Command:
AREA
Specify first corner point or [Object/Add/Subtract]: o
Select objects: the hatch
Area = 2417.06, Perimeter = 487.90
As it can be see , the sum of the 2 polys area is equal to the hacht area
Please clear me.