static void Main(string[] args)
{
Shape rectangle = new Rectangle(12, 32);
Shape square = new Square(12);
Shape triangle = new Triangle(12, 32, 22);
Console.WriteLine("The rectangle's area is: {0}; IsLegal: {1}", rectangle.Area, rectangle.IsLegal());
Console.WriteLine("The square's area is: {0}; IsLegal: {1}", square.Area, square.IsLegal());
Console.WriteLine("The triangle's area is: {0}; IsLegal: {1}", triangle.Area, triangle.IsLegal());
}