Java Program to Calculate Area of Triangle

Last Updated: 16 July, 2022

In this tutorial, we are going to learn how to find the area of a triangle.

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted △ABC.

We can calculate the area of a triangle based on the below given formula.

Area of Triangle=(width * height) / 2;

Let's see how to write a Java program and use this formula.

Program 1 : Find the area of a triangle in Java

  public class AreaOfTriangle {
    public static void main(String[] args) {
      // Width of the Triangle
      double width = 21.75;
      // Height of the Triangle
      double height = 10.50;
      
      // Calculating area of Triangle
      double area = (width * height) / 2;
      
      System.out.println("Width of Triangle: " + width);
      System.out.println("Height of Triangle: " + height);
      System.out.println("Area of Triangle: " + area);
    }
  }

Program 2 : Find the area of a triangle in Java with user input

  
  import java.util.Scanner;
  public class AreaOfTriangle2 {
    public static void main(String[] args) {
      Scanner scanner = new Scanner(System.in);
      
      // Width of the Triangle
      System.out.print("Enter Triangle width: ");
      double width = scanner.nextDouble();
      
      // Height of the Triangle
      System.out.print("Enter Triangle Height: ");
      double height = scanner.nextDouble();
      
      scanner.close();
      
      // Calculating area of Triangle
      double area = (width * height) / 2;
      
      System.out.println("Area of Triangle: " + area);
    }
  }

Enter Triangle width: 30.5
Enter Triangle Height: 20.75
Area of Triangle: 316.4375