Compute area of circle

-
public class circlearea
{
public static void main(String arg[])
{
double radius;
double area;
radius=20;
area=radius*radius*3.14;
System.out.println("Area of circle having radius 20 is "+area);   //here + is use to concatenate                                                                                                                        //string and variable.
}
}

Output: - 

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