import java.util.Scanner;
public class prosedur{
static Scanner in = new Scanner(System.in);
static void segitiga(){
int alas, tinggi;
double luas;
System.out.print("Alas : "); alas = in.nextInt();
System.out.print("Tinggi : "); tinggi = in.nextInt();
luas = 0.5 * alas * tinggi;
System.out.print("Luasnya : " + luas);
}
static void lingkaran(){
int r;
double luas;
System.out.print("Jari-jari : "); r = in.nextInt();
luas = 3.14 * r * r;
System.out.print("Luasnya : " + luas);
}
public static void main(String[] args){
int pil;
System.out.println("Pilihlah yg anda suka (1/2)");
pil = in.nextInt();
if(pil == 1){
segitiga();
}
else if(pil == 2){
lingkaran();
}
}
}
public class prosedur{
static Scanner in = new Scanner(System.in);
static void segitiga(){
int alas, tinggi;
double luas;
System.out.print("Alas : "); alas = in.nextInt();
System.out.print("Tinggi : "); tinggi = in.nextInt();
luas = 0.5 * alas * tinggi;
System.out.print("Luasnya : " + luas);
}
static void lingkaran(){
int r;
double luas;
System.out.print("Jari-jari : "); r = in.nextInt();
luas = 3.14 * r * r;
System.out.print("Luasnya : " + luas);
}
public static void main(String[] args){
int pil;
System.out.println("Pilihlah yg anda suka (1/2)");
pil = in.nextInt();
if(pil == 1){
segitiga();
}
else if(pil == 2){
lingkaran();
}
}
}

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