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Posted 26 Oct 2012

# Area of a Triangle in the Cartesian Coordinate System

, 27 Oct 2012 CPOL
For absolute beginners in Java
 /* Author: @TharieHimself */ import java.util.Scanner; public class Triangle{ public static void main(String[] args) { Triangle tri = new Triangle(); tri.calcArea(); } public void calcArea(){ Scanner scan = new Scanner(System.in); double[][] coordinates = new double[3][2]; double[] sides = new double[3]; int count = 0; String axis; for(int r=0; r<3; r++) { for(int c=0; c<2;c++){ count++; axis = (count % 2 == 0) ? "Y" : "X"; System.out.print("Enter "+axis+" Coordinate for Node "+count+": "); coordinates[r][c] = scan.nextDouble(); } } /* THIS PART CAN NOT BE ACHIEVED THROUGH A FOR LOOP; THERE IS NO PATTERN */ sides[0] = Math.sqrt((Math.pow((coordinates[0][0]- coordinates[1][0]), 2)) + Math.pow((coordinates[0][1] - coordinates[1][1]), 2)); sides[1] = Math.sqrt((Math.pow((coordinates[1][0]- coordinates[2][0]), 2)) + Math.pow((coordinates[1][1] - coordinates[2][1]), 2)); sides[2] = Math.sqrt((Math.pow((coordinates[2][0]- coordinates[0][0]), 2)) + Math.pow((coordinates[2][1] - coordinates[0][1]), 2)); double s = (sides[0]+ sides[1]+ sides[2])/2; double area = Math.sqrt(s*(s-sides[0])*(s-sides[1])*(s-sides[2])); /* THIS WILL ROUND OFF THE AREA TO THREE DECIMAL PLACES */ double roundOff = Math.round(area * 1000.0) / 1000.0; if(!(area > 0)) System.out.println("\nYour Triangle does not exist!"); else System.out.println("\nArea of your Triangle is: "+roundOff); } }

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