public class Avg{
public static void main(String[] args){
double a,b,s;
a=Math.PI;
b=5.5;
s=a*b*b;
System.out.println("这个圆的面积是:"+s);
}
}
public class Avg{
public static void main(String[] args){
double a,b,s;
a=Math.PI;
b=5.5;
s=a*b*b;
System.out.println("这个圆的面积是:"+s);
}
}