//PROGRAM 8-1
package ContohPkg;

public class Lingkaran {
  private final double PI = 3.1416;
  
  private double r;
  
  public Lingkaran(double r) {
  	this.r = r;
  }
  
  public double luas() {
  	return (PI * r * r);
  }
  
  public double keliling() {
  	return (2 * PI * r);
  }  	
}