# C Program to Find Third Angle of a Triangle

In this tutorial, i am going to show you how to find the third angle of a triangle if two angles are given in c programs.

## All C Programs and Algorithm to Find Third Angle of a Triangle

• Algorithm to find third angle of a triangle
• C Program to Find Third Angle of a Triangle

### Algorithm to find third angle of a triangle

Follow the below given algorithm to write a program to find the third angle of a triangle if two angles are given; as follows:

1. Input two angles of triangle from user and store it in some variables.
2. Compute third angle of triangle using formula `c = 180 - (a + b)`.
3. Print value of third angle i.e. print c.

### C Program to Find Third Angle of a Triangle

```/*
* Given two angles of a triangle, Here is the
* C program to find third angle
*/

#include <stdio.h>
#define ANGLE_SUM 180

int main() {
/* Three angles of a triangle */
float a1, a2, a3;

/*
* Take two angles as input from user
*/
printf("Enter Two Angles of a Triangle :- ");
scanf("%f %f", &a1, &a2);

/* Sum of all three angles of a triangle is 180 degrees */
a3 = ANGLE_SUM - (a1 + a2);

printf("Third Angle = %0.4f", a3);

return 0;
}```

The output of the above c program; as follows:

```Enter Two Angles of a Triangle :- 60 30
Third Angle = 90.0000```