static void Main(string[] args) { Triangle t = new Triangle(); Square s = new Square(); Rhombus rh = new Rhombus(); Rectangle rect = new Rectangle(); Parallelogram p = new Parallelogram(); Trapeze tr = new Trapeze(); Circle r = new Circle(20); Ellipse e = new Ellipse(); Console.WriteLine(t); Console.WriteLine(s); Console.WriteLine(rh); Console.WriteLine(rect); Console.WriteLine(p); Console.WriteLine(tr); Console.WriteLine(r); Console.WriteLine(e); }