uts_nomor_1

import javax.swing.JOptionPane;


public class uts_nomor_1 {

public static void main(String[] args) {
final double phi = 3.142857;
double d = Double.parseDouble(JOptionPane.showInputDialog("masukkan diameter lingkaran: "));
double r = d/2;

System.out.println("jadi luas lingkarannya adalah: "+phi*r*r);
}

}

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