C program to find angles of triangle if two angles are given

Write a C Program to input two angles of a triangle and find third angle of the triangle. How to find all angles of a triangle if two angles are given by user using C programming. C program to calculate the third angle of a triangle if two angles are given.

ExampleInput

Enter first angle: 60
Enter second angle: 80

Output

Third angle = 40

Required knowledge

Fundamentals of C, Data types, Talking user input in C

Properties of triangle

We know that sum of all angles of a triangle is 180°.
Sum of angles of triangle

Hence, by applying basic mathematics we can easily derive a formula for finding the third angle. The formula for third angle is given by.

formula for third angle of a triangle

Logic to find third angle of a triangle

Basic step by step descriptive logic to find third angle of a triangle -

  1. Input two angles of triangle from user and store it in some variable say a and b.
  2. Apply formula for finding the third angle. Triangle formula is given by c = 180 - (a + b).
  3. Print value of third angle i.e. print c.

Program to find angles of a triangle

/**
 * C program to find all angles of a triangle if two angles are given
 */

#include <stdio.h>

int main()
{
    int a, b, c;

    // Input two angles of the triangle
    printf("Enter two angles of triangle: ");
    scanf("%d%d", &a, &b);

    // Calculate the third angle
    c = 180 - (a + b);

    // Print value of the third angle
    printf("Third angle of the triangle = %d", c);

    return 0;
}

Output

Enter two angles of triangle: 60 30
Third angle of the triangle = 90

Happy coding 😉

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