Area of a circle = pi * r * r.
where:
r is the radius of the circle.
pi is a mathematical constant.
Program to Calculate Circle Area using Java.
/**
* Program to Calculate Circle Area using Java Example.
* @author W3schools360
*/
public class CirleAreaExample {
static void circleArea(int radius){
double area = Math.PI * radius * radius;
//Print Circle Area.
System.out.println("Circle area: " + area);
}
public static void main(String args[]){
//method call
circleArea(20);
}
}
/**
* Program to Calculate Circle Area using Java Example.
* @author W3schools360
*/
public class CirleAreaExample {
static void circleArea(int radius){
double area = Math.PI * radius * radius;
//Print Circle Area.
System.out.println("Circle area: " + area);
}
public static void main(String args[]){
//method call
circleArea(20);
}
}
/** * Program to Calculate Circle Area using Java Example. * @author W3schools360 */ public class CirleAreaExample { static void circleArea(int radius){ double area = Math.PI * radius * radius; //Print Circle Area. System.out.println("Circle area: " + area); } public static void main(String args[]){ //method call circleArea(20); } }
Output:
Circle area: 1256.6370614359173
Circle area: 1256.6370614359173
Circle area: 1256.6370614359173