static void Main(string[] args)
{
TwoDimShape[] myShapes = new TwoDimShape[3];
myShapes[0] = new Rectangle(10, 5);
myShapes[1] = new Triangle(12, 6);
myShapes[2] = new Circle(8);
foreach (TwoDimShape tds in myShapes)
{
ProcessShape(tds);
Console.WriteLine("");
}
}
// static method processShape
public static void ProcessShape(TwoDimShape obj)
{
Console.Write($"Area = {obj.Area()}");
}