//extending interface
interface value{
final static float p=3.142F;
}
interface Areas extends value{
float calculate(float x);
}
class circle implements Areas{
public float calculate(float x) {
return x*x*p;
}
}
public class assign11{
public static void main(String args[]){
circle cr=new circle();
float x=cr.calculate(5);
System.out.println("Area of circle:" +x);
}
}