import java.util.Scanner;
public class Segitiga
{
    public static void main(String[] args)
    {
        Scanner masukan = new Scanner(System.in);
        int pilihan=9;
        do
        {
            System.out.println("\nMENU\n");
            System.out.println("1. Keliling Segitiga");
            System.out.println("2. Menghitung Luas Segitiga");
            System.out.println("3. Keluar");
            System.out.print("Masukkan Pilihan Anda : ");
            pilihan = masukan.nextInt();
            switch(pilihan)
            {
                case 1 : Keliling(); break;
                case 2 : Luas(); break;
            }
        } while(pilihan != 3);
    }

    private static void Keliling()
    {
        Scanner masukan = new Scanner(System.in);
        float a,b,k,c;
        System.out.print("Masukkan nilai sisi-sisinya : ");
        a = masukan.nextFloat();
        b = masukan.nextFloat();
        c = masukan.nextFloat();
        k = a+b+c;
        System.out.println("Keliling : " + k);
    }

    private static void Luas()
    {
        Scanner masukan = new Scanner(System.in);
        float a,b,l;
        System.out.print("Masukkan nilai alas : ");
        a = masukan.nextFloat();
        System.out.print("Masukkan nilai tinggi : ");
        b = masukan.nextFloat();
        l = a*b/2;
        System.out.println("Keliling : " + l);
    }
}