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:

- Input two angles of triangle from user and store it in some variables.
- Compute third angle of triangle using formula
`c = 180 - (a + b)`

. - 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