C Exercises: Find the third angle of a triangle if two are given

Last update on July 29 2025 12:53:45 (UTC/GMT +8 hours)

10. Triangle Third Angle Calculation

Write a C program to find the third angle of a triangle if two angles are given.

Pictorial Presentation:

C Input Output: Find the third angle of a triangle if two are given

Sample Solution:

C Code:

#include <stdio.h>
int main()  
{  
    int ang1, ang2, ang3; /*are three angles of a triangle  */
  
    /* Read two angles of the triangle from user separated by comma*/  
    printf("Input two angles of triangle separated by comma : ");  
    scanf("%d, %d", &ang1, &ang2);  
  
     ang3 = 180 - (ang1 + ang2);  /* Calculates the third angle  */
  
    printf("Third angle of the triangle :  %d\n", ang3);  
  
    return 0;  
}

Sample Output:

Input two angles of triangle separated by comma : 50,70                                                       
Third angle of the triangle :  60

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to calculate the third angle of a triangle and verify that the sum of angles equals 180 degrees.
Write a C program to compute the missing angle of a triangle and output an error message if the provided angles are invalid.
Write a C program to determine the third angle of a triangle and classify the triangle as acute, right, or obtuse based on its angles.
Write a C program to calculate the missing angle of a triangle and then display all three angles in ascending order.

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