Java: Check whether three given lengths of three sides form a right triangle

Last update on May 13 2025 12:59:02 (UTC/GMT +8 hours)

Check If Sides Form Right Triangle

Write a Java program to check whether three given lengths (integers) of three sides form a right triangle. Print "Yes" if the given sides form a right triangle otherwise print "No".

Input:

Integers separated by a single space. 1 ≤ length of the side ≤ 1,000

Visual Presentation:

Sample Solution:

Java Code:

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

class Main {
    // Creating a Scanner object for user input
    Scanner sc = new Scanner(System.in);

    // Method to execute the main functionality
    public void run() {
        // Prompting the user to input three integers (sides of a triangle)
        System.out.println("Input three integers(sides of a triangle)");

        // Reading three integers and storing them in an array
        int[] int_num = new int[]{
            sc.nextInt(), sc.nextInt(), sc.nextInt()
        };

        // Sorting the array of integers in ascending order
        Arrays.sort(int_num);

        // Checking if the given sides form a right triangle
        System.out.println("If the given sides form a right triangle?");
        ln((int_num[2] * int_num[2] == int_num[0] * int_num[0] + int_num[1] * int_num[1]) ? "Yes" : "No");
    }

    // Main method to create an instance of the class and run the program
    public static void main(String[] args) {
        new Main().run();
    }

    // Method for printing without a newline
    public static void pr(Object o) {
        System.out.print(o);
    }

    // Method for printing with a newline
    public static void ln(Object o) {
        System.out.println(o);
    }

    // Method for printing an empty line
    public static void ln() {
        System.out.println();
    }
} 

Sample Output:

Input three integers(sides of a triangle)
 6 9 12
If the given sides form a right triangle?
No

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to check if three given side lengths form an acute, right, or obtuse triangle.
• Write a Java program to validate a right triangle using the Pythagorean theorem with floating-point precision.
• Write a Java program to classify a triangle by angles after confirming the sides form a right triangle.
• Write a Java program to check if three sides provided in random order can form a right triangle.

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