hitung segitiga (netbeans)

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/**
 *
 * @author user
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public class Segitiga {
     public static void main(String[] args) {
        int a = 4;
        int t = 2;
        double L ;
        L = a*t*0.5 ;
       
   System.out.println ("Luas segitiga dengan a = "+a+"& t="+t+" adalah" +L);
     }
   
}