(URI) Triângulo - Solução

import java.io.*;
import java.util.*;
import java.lang.*;

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    public boolean isATriangle(float n1, float n2, float n3) {
        if (n1 > Math.abs(n2-n3) && Math.abs(n2+n3) > n1) {
            return true;
        }
       
        return false;
    }
   
    public void processa() throws NumberFormatException, IOException {
        Scanner sc = new Scanner(System.in);
       
        float n1 = sc.nextFloat();
        float n2 = sc.nextFloat();
        float n3 = sc.nextFloat();

        if (isATriangle(n1, n2, n3) && isATriangle(n2, n3, n1) && isATriangle(n3, n1, n2)) {
            System.out.println("Perimetro = " + (n1+n2+n3));
        }
        else {
            System.out.println("Area = " + String.format("%.1f", (((n1+n2)/2)*n3)));
        }
                           
        return;
    }
}