public double Area()
{
double holeSum = 0;
Holes.ForEach((hole) => holeSum += hole.Area());
return(Math.Abs(SignedContourArea()) - holeSum);
}
public static double GetArea(PolygonList polygonList)
{
double totalArea = 0;
polygonList.ForEach(polygon => totalArea += GetArea(polygon));
return(totalArea);
}