*2.19 (Geometry: area of a triangle) Write a program that prompts the user to enter three points (x1, y1) , (x2, y2) , (x3, y3) of a triangle and displays its area. The formula for computing the area of a triangle is:
import java.util.Scanner; public class ProgrammingEx2_19 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter three points for a triangle:"); double x1 = input.nextDouble(); double y1 = input.nextDouble(); double x2 = input.nextDouble(); double y2 = input.nextDouble(); double x3 = input.nextDouble(); double y3 = input.nextDouble(); double side1 = Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2)); double side2 = Math.sqrt(Math.pow(x2 - x3, 2) + Math.pow(y2 - y3, 2)); double side3 = Math.sqrt(Math.pow(x1 - x3, 2) + Math.pow(y1 - y3, 2)); double s = (side1 + side2 + side3) / 2; double area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3)); System.out.print("The area of the triangle is " + area); } }
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