static void Main(string[] args)
{
rectangle rectangle = new rectangle(23.21, 23.23);
rectangle.getArea();
circle circle = new circle(23.12);
circle.getArea();
Console.WriteLine("area of rectangle is" + rectangle.getArea());
Console.WriteLine("area of circle is" + circle.getArea());
Console.ReadLine();
}
public static void Main()
{
rectangle r1 = new rectangle(10, 20);
r1.getArea();
triangle t1 = new triangle(30, 40);
}