Lingkaran

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package mainmenu;

/**
 *
 * @author Rae
 */
public class Lingkaran {
    double  phi = 3.14;
    double jari, luas;
    public void setJari(double r) {
        jari = r;
    }
    public void setLuas() {
        luas = phi * jari * jari;
    }
    public double getLuas()
    {
        return luas;
    }
}