C Exercises: Check three sides of a triangle form a right triangle or not

Last update on September 19 2025 12:44:51 (UTC/GMT +8 hours)

Check if three sides form a right triangle

Write a C program to check whether the three given lengths (integers) of three sides of a triangle form a right triangle or not. 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

Sample Solution:

C Code:

#include<stdio.h>

int main()
{
    int x, y, z;

    // Prompt the user to input the three sides of a triangle
    printf("Input the three sides of a triangle:\n");

    // Read the input values for x, y, and z
    scanf("%d %d %d", &x, &y, &z);

    // Check if the triangle is a right angle triangle
    if ((x*x) + (y*y) == (z*z) || (x*x) + (z*z) == (y*y) || (y*y) + (z*z) == (x*x))
    {
        // If the condition is true, print that it's a right angle triangle
        printf("It is a right angle triangle!\n");
    }
    else
    {
        // If the condition is false, print that it's not a right angle triangle
        printf("It is not a right angle triangle!\n");
    }

    return 0; // End of the program
}

Sample Output:

Input the three sides of a trainagel:
12
11
13
It is not a right angle triangle!

Flowchart:

C Programming Flowchart: Check three sides of a triangle form a right triangle or not.

For more Practice: Solve these Related Problems:

Write a C program to check if three given integers satisfy the Pythagorean theorem and form a right triangle.
Write a C program to read three side lengths and determine if they can form a right triangle using squared comparisons.
Write a C program to implement a function that returns true if the provided sides form a right triangle.
Write a C program to sort three side lengths and then check if the largest squared equals the sum of squares of the other two.

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