Cerchio

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package javaapplication5;

/**
 *
 * @author quartaaif
 */
public class Cerchio {
    private double raggio;
    private double area;
    private double circonferenza;

     public double setRaggio(double a){
       return this.raggio=a;
    }

    public double area(){
    return area=(this.raggio * this.raggio * Math.PI);
    }


        public double circonferenza(){
        return this.circonferenza = 2 * Math.PI * this.raggio;
        }

}