static void Main(string[] args)
{
Retangulo x = new Retangulo(double.Parse(Console.ReadLine()), double.Parse(Console.ReadLine()));
Console.WriteLine(x.CalcArea());
Console.WriteLine(x.CalcDiagonal());
Quadrado y = new Quadrado(double.Parse(Console.ReadLine()));
Console.WriteLine(y.CalcArea());
Console.WriteLine(y.CalcDiagonal());
}
