import java.util.Scanner;
public class soal_101 {
public static void main (String[] args) {
Scanner masukan = new Scanner(System.in);
double r, luas, keliling;
double phi=3.14;
System.out.print(" masukan nilai jari -jari :");
r = masukan.nextDouble();
System.out.println();
System.out.print(" luas lingkaran :");
luas =0.5 * phi * r * r ;
System.out.print(luas);
System.out.println();
System.out.print(" keliling lingkaran :");
keliling = 2 * phi * r ;
System.out.print(keliling);
}
}
berikut hasil outputnya :
public class soal_101 {
public static void main (String[] args) {
Scanner masukan = new Scanner(System.in);
double r, luas, keliling;
double phi=3.14;
System.out.print(" masukan nilai jari -jari :");
r = masukan.nextDouble();
System.out.println();
System.out.print(" luas lingkaran :");
luas =0.5 * phi * r * r ;
System.out.print(luas);
System.out.println();
System.out.print(" keliling lingkaran :");
keliling = 2 * phi * r ;
System.out.print(keliling);
}
}
berikut hasil outputnya :