Calculate area of Triangle

Here we will see how to calculate area of triangle. We will see two following programs to do this:

1) Program 1: Prompt user for base-width and height of triangle.
2) Program 2: No user interaction: Width and height are specified in the program itself.

Program 1:

import java.util.Scanner;
class AreaTriangleDemo {
   public static void main(String args[]) {   
      Scanner scanner = new Scanner(System.in);

      System.out.println("Enter the width of the Triangle:");
      double base = scanner.nextDouble();

      System.out.println("Enter the height of the Triangle:");
      double height = scanner.nextDouble();

      //Area = (width*height)/2
      double area = (base* height)/2;
      System.out.println("Area of Triangle is: " + area);      
   }
}

Output

Enter the width of the Triangle:
2
Enter the height of the Triangle:
2
Area of Triangle is: 2.0

Program 2:

class AreaTriangleDemo2 {
   public static void main(String args[]) {   
      double base = 20.0;
      double height = 110.5;
      double area = (base* height)/2;
      System.out.println("Area of Triangle is: " + area);      
    }
}