URI Problem (Triangle) 1043:
Triangle is a basic problem on URI online judge for novice problem solver.
You can find details on this Link.

import java.util.Scanner;

/**
 * @Author : Muhammad Harun-Or-Roshid
 * @Date : Oct 10, 2016
 * @Time : 10:50:53 PM
 */
public class Uri1043 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a, b, c, perimeter, area_trapezium;
        a = sc.nextDouble();
        b = sc.nextDouble();
        c = sc.nextDouble();
        if ((a + b) > c && (b + c) > a && (c + a) > b) {
            perimeter = a + b + c;
            System.out.printf("Perimetro = %.1f\n", perimeter);
        } else {
            area_trapezium = ((a + b) / 2) * c;
            System.out.printf("Area = %.1f\n", area_trapezium);
        }
    }

}