How to apply oops concept here

Hi,

Just check it out

public abstract class shape
{
public int _area;
protected double radius;

public void setRadius(double r)
{
radius = r;
}


public abstract double Circle();

}
public class area:shape
{
public area(int len,int breadth)
{
_area= len * breadth;
}
public area(int a)
{
_area = a*a;
}
public override double Circle()
{
return 3.14 * radius * radius;
}
}

class Program
{
static void Main(string[] args)
{
var a = new area(5);
var b = new area(5,7);
b.setRadius(5);
Console.WriteLine("Area of Square: {0}",a._area);
Console.WriteLine("Area of Rectangle: {0}", a._area);
Console.WriteLine("Area of Rectangle: {0}", b._area);
Console.WriteLine("Area of Circle: {0}", b.Circle());
Console.ReadKey();
}
}

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