Java Program to Find Area of Right Angled Triangle

  • Write a Java program to find the area of a Right Angled Triangle.
  • What is the formulae to calculate area of triangle.

To calculate the area of a Right-angled triangle, first we need to understand some fundamental properties of a right angled triangle. Right triangle is a triangle in which one angle is a right angle (90 degree). The sum of the other two angles of right-angled triangle is 90 degree.

Sides of Right Triangle

  • Base and Perpendicular : The two adjacent sides of the right angle. These are the two sides of a triangle which are not hypotenuse.
  • Hypotenuse : Hypotenuse is the longest side of a right angled triangle which is opposite the right angle.

Area of Right angled Triangle
Area of Right triangle, if we know the length of base and perpendicular.
  • Area of Right Triangle = (1/2)* Base * Perpendicular

If we know the length of hypotenuse and altitude of a right triangle, then we can use below mentioned formula to find area of a right triangle.
  • Area of Right Triangle = (1/2)* Hypotenuse * Altitude
Where, Altitude is the perpendicular distance between hypotenuse and vertex containing right angle(vertex opposite of hypotenuse).

Java program to calculate area of right triangle


import java.util.*;

class TriangleArea {
    public static void main(String args[]) {
    double base, height, area;
    Scanner in = new Scanner(;
    System.out.println("Enter length of base of Triangle");
    base = in.nextDouble();

    System.out.println("Enter length if height of Triangle");
    height = in.nextDouble();

    // Area if Triangle = (Base X Height)/2;
    area = (base * height)/2;
    System.out.println("Area of Triangle = " + area);      
Enter length of base of Triangle
Enter length if height of Triangle
Area of Triangle = 6.0